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"""
1:Kevin
2:Guang Zhu Cui
3:Ze Yue
"""
"""
Project: Team Work
1. Each team member generate 5K entry of data
Description:
Generate a 5K lines of record and save them into a CSV file
Each entry should record such information as:
StudentID, First Name, Last Name, DateOfBirth, ClassNo, GPA
Sample:
20180001, fn-Bill, ln-Gates, 1995-03-05, C301, 3.3
Field Pattern
StudentID, 8-digit-number, yyyy+4-digit sequence no, 20180001
2018 to 2020, 0001 - 5000
First Name, string of prefix + 3-10 characters, 'fn-' prefix + randomly generated
Last Name, string of prefix + 3-10 characters, 'ln-' prefix + randomly generated
DateOfBirth, string of 8 char, yyyy-mm-dd, 2000-03-05
the range of year 1990 - 2010
ClassNo, C101, to C105, C201, to, C205 to C601 to C605, randomly generated
GPA, 0 to 4.0, randomly generated, #.##, #.#
Number of Records:
5,000 lines
Data File Format:
CSV
2. Each team member collects other two members' data file(s) in format of CSV
3. Calculate the GPA for every students and print out the report properly
export as a text file
summary
detail
4. Consider time management
schedule
meeting
"""
import random
import string
# student ID
def student_ID():
stuid = []
first_4_chars_student_id = str(random.randint(2018, 2020))
last_4_chars_student_id = str(random.randint(1, 5000))
stuid.append(last_4_chars_student_id)
if last_4_chars_student_id in stuid:
pass
if len(last_4_chars_student_id) == 3:
last_4_chars_student_id = '0' + last_4_chars_student_id
if len(last_4_chars_student_id) == 2:
last_4_chars_student_id = '00' + last_4_chars_student_id
if len(last_4_chars_student_id) == 1:
last_4_chars_student_id = '000' + last_4_chars_student_id
student_id = first_4_chars_student_id.__add__(last_4_chars_student_id)
return student_id
# first name
def fn():
first_name = 'fn-'
len_first_name = random.randint(3, 9)
a = 0
for i in range(len_first_name):
first_char_fn = random.choice(string.ascii_uppercase)
chars_fn = random.choice(string.ascii_lowercase)
if a == 0:
first_name += first_char_fn
first_name += chars_fn
a += 1
return first_name
# last name
def ln():
last_name = 'ln-'
len_last_name = random.randint(3, 9)
a = 0
for i in range(len_last_name):
first_char_ln = random.choice(string.ascii_uppercase)
chars_ln = random.choice(string.ascii_lowercase)
if a == 0:
last_name += first_char_ln
last_name += chars_ln
a += 1
return last_name
# birthdate
def date_of_birth():
year = str(random.randint(1990, 2010))
month = str(random.randint(1, 12))
# months = (1,3,5,7,8,10,12)
# if month in months:
# pass
if month == '1' or month == '3' or month == '5' or month == '7' or month == '8' or month == '10' or month == '12':
date = str(random.randint(1, 31))
elif month == '2':
date = str(random.randint(1, 28))
else:
date = str(random.randint(1, 30))
if year == '1992' or year == '1996' or year == '2000' or year == '2004' or year == '2008' and month == '2':
date = str(random.randint(1,29))
if len(month) == 1:
month = '0' + month
if len(date) == 1:
date = '0' + date
birthdate = year + '-' + month + '-' + date
return birthdate
# class NO
def class_no():
class_number = 'C'
first_number_in_the_class_number = str(random.randint(1, 5))
last_number_in_the_class_number = str(random.randint(1, 5))
class_number += first_number_in_the_class_number
class_number += '0'
class_number += last_number_in_the_class_number
return class_number
# GPA
def GPA():
gpa = round(random.uniform(0.1, 4.0), 2)
return gpa
# main
try:
csv_file = open('File_CSV_2.csv', 'w')
csv_file.truncate(0)
for i in range(1, 5001):
a = '{},{},{},{},{},{}\n'.format(student_ID(), fn(), ln(), date_of_birth(), class_no(), GPA())
csv_file.write(a)
except FileNotFoundError as fe:
print(fe)
except Exception as e:
print(e)
finally:
csv_file.close()
|
"""
[Homework]
Date: 2021-02-21
1. Write a GUI program of Label counter for implementing version 3.
Requirements:
(Function)
When the number reaches 10, then it comes to stop and displays the text of 'END'.
If a user clicks to close the main window, the program terminates.
(UI)
Using the layout manager of pack() for the UI.
A recommended UI design is given below.
"""
"""
score:
perfect
"""
# import tkinter as tk
from tkinter import *
from tkinter.ttk import Separator
def start_counting(mylabel):
print("entered start_counting()")
counter = 0
def counting():
nonlocal counter
counter = counter + 1
if counter > 10:
counter = "END"
mylabel.config(text=str(counter))
if counter == "END":
return
mylabel.after(1000, counting)
counting()
# main program
root = Tk()
root.title('Python GUI - Label counter')
root.geometry("{}x{}+200+240".format(800, 560))
root.configure(bg='#ddddff')
# title label object
label1 = Label(root, text="Label Counter", bg="blue", fg="white", height=2, width=100, font="Helvetic 35 bold")
label1.pack()
# separator
sep1 = Separator(root, orient=HORIZONTAL)
sep1.pack(fill=X)
# counter label object
digit_label = Label(root,
bg="seagreen",
fg='white',
height=8,
width=100,
font="Helvetic 30 bold")
digit_label.pack()
# separator
sep1 = Separator(root, orient=HORIZONTAL)
sep1.pack(fill=X)
# footer label object
label2 = Label(root, text="Version 3 | Ze Yue Li | 2021-02-26", bg="red", fg="white", height=2, width=100, font="Helvetic 35 bold")
label2.pack()
# counting
start_counting(digit_label)
root.mainloop()
|
"""
for loop ex
"""
# sum from 1..1000
sum = 0
for i in list(range(1,1001)):
sum = i + sum
print("The sum of the sequence is {}".format(sum))
sum = 0
for i in range(1,1001):
# sum = i + sum
sum += i
print("The sum of the sequence is {}".format(sum))
# prod from 1..20
prod = 1
for i in range(1,21):
prod *= i
print("The prod of the sequence is {}".format(prod))
|
"""
Homework 3
"""
# 1.
dict1 = {1: 'a', 2: 'b', 3: 'c'}
dict2 = {}
def dictchecker(dictionary):
if len(dictionary) == 0:
return "Length is 0"
else:
return "Length is not 0"
print(dictchecker(dict1))
print(dictchecker(dict2))
# 2.
def square(num):
mydict = {key: key * key for key in range(1, num + 1)}
return mydict
print(square(5))
print(square(11))
# 3.
mydict = {7: 11, 25: 12, 745: 34, 6: 86, 13: 8, 40: 58, 93: 72, 38: 66}
def maxandmin(dictionary):
return max(mydict.values()), min(mydict.values())
print(maxandmin(mydict))
|
"""
app: unit converter
ver: 1
author: Yi
"""
def kilometers_miles(x):
s = x * 0.621371
return s
def miles_kilometers(x):
s = x * 1.609344
return s
def fahrenheit_celsius(x):
s = (x - 32) * 5/9
return s
def celsius_fahrenheit(x):
s = (x * 9/5) + 32
return s
def kilogram_pound(x):
s = x * 2.20462
return s
def pound_kilogram(x):
s = x * 0.453592
return s
def meter_foot(x):
s = x * 3.28084
return s
def foot_meter(x):
s = x * 0.3048
return s
print("1: Length or distance")
print("2: Temperature")
print("3: Weight")
print("4: Area")
choice = input("choice(1/2/3/4):")
if choice =='1':
print("1: kilometers to miles:")
print("2: miles to kilometers:")
choice2 = input("choice(1/2):")
if choice2 =='1':
c = float(input("a number"))
s = kilometers_miles(c)
print("the number {} * 0.621371 = {}".format(c, s))
if choice2 =='2':
c = float(input("a number"))
s = miles_kilometers(c)
print("the number {} * 0.1.609344 = {}".format(c, s))
elif choice =='2':
print("1: fahrenheit_celsius:")
print("2: celsius_fahrenheit:")
choice2 = input("choice(1/2):")
if choice2 =='1':
c = float(input("a number"))
s = fahrenheit_celsius(c)
print("the number {} - 32 * 5/9 = {}".format(c, s))
if choice2 =='2':
c = float(input("a number"))
s = celsius_fahrenheit(c)
print("the number ({} * 9/5) + 32 = {}".format(c, s))
elif choice == '3':
print("1: kilogram_pound:")
print("2: pound_kilogram:")
choice2 = input("choice(1/2):")
if choice2 =='1':
c = float(input("a number"))
s = kilogram_pound(c)
print("the number {} * 2.20462 = {}".format(c, s))
if choice2 =='2':
c = float(input("a number"))
s = pound_kilogram(c)
print("the number {} * 0.453592 = {}".format(c, s))
elif choice == '4':
print("1: meter_foot:")
print("2: foot_meter:")
choice2 = input("choice(1/2):")
if choice2 =='1':
c = float(input("a number"))
s = meter_foot(c)
print("the number {} * 3.28084 = {}".format(c, s))
if choice2 =='2':
c = float(input("a number"))
s = foot_meter(c)
print("the number {} * 0.3048 = {}".format(c, s))
else:
print("this option does not exist.") |
"""
boolean value
boolean literal
"""
bool1 = True
bool2 = False
print("bool1=", bool1)
print("bool2=", bool2)
# True => 1
print(True + 1)
print(True == 1)
# False => 0
print(False == 0)
print(False + 1)
|
"""
Calculate the GPA for every student and print out the report properly
export as a text file
"""
try:
csvfile1 = open("File_CSV_1.csv")
csvfile2 = open("File_CSV_2.csv")
csvfile3 = open(r"C:\Users\Li\PycharmProjects\stem1401python\py201011\File_CSV_3.csv")
stugpas = open("studentGPAs.txt", "w")
content = csvfile1.readlines() + csvfile2.readlines() + csvfile3.readlines()
split_content = []
gpas = []
for i in range(len(content)):
content[i] = content[i].split(",")
for j in content[i]:
if content[i][-1] == j:
gpas.append(j[:-1])
for i in range(len(gpas)-1):
try:
gpas[i] = float(gpas[i])
except Exception as e:
gpas.pop(i)
print(gpas)
sum = 0
for i in gpas:
try:
sum += i
except Exception as e:
print(e)
average = sum / len(gpas)
for i in gpas:
stugpas.write(str(i))
stugpas.write("\n")
stugpas.write(f"The average GPA is {average}")
except Exception as e:
print(e)
finally:
csvfile1.close()
csvfile2.close()
csvfile3.close()
|
"""
1. Write a program to generate a list.
selecting all even numbers from 1 to 100, and then generate a list in which each item is square of the corresponding even number.
Hints: Using list comprehension
Sample: [1,2,3,4,5,6,7,...100]
Expected Result: [ 4, 16, 36, 64, 100, ... , 10000]
2. Write a program to generate a list.
There are two given string 'ABC' and 'XYZ'
generating a new list like ['AX', 'AY', 'AZ', 'BX', 'BY', 'BZ', 'CX', 'CY', 'CZ']
Hints: Using list comprehension
"""
# 1
list1 = []
for i in range(1,101):
list1.append(i)
print(list1)
result = [i**2 for i in list1 if i %2 == 0]
print(result)
# 2
# linear algebra
string1 = 'ABC'
string2 = 'XYZ'
result = []
for i1 in string1:
for i2 in string2:
print(i1+i2)
result.append(i1+i2)
print(result) |
"""
"""
# how to create
list1 = []
list2 = [1,2,3]
list3 = list(list2) # clone
list4 = list3 # reference
# how to access items in a list
# by index
nested_list = [[1,2,3],[1,2,3],[1,2,3]]
print(nested_list[0][0])
# negative index
# slicing
list5 = [1,2,34,6,6,67,7,8,8,9,9]
print(list5[2:5])
print(list5[:5])
print(list5[5:])
print(list5[:])
# update element in a list
list5[0] = 999
print(list5)
list5[1:4] = [777,888,999]
print(list5)
# add elements
list5.append('abc')
print(list5)
list5.extend([123,123,123])
print(list5)
# +
list6 = [1,2,3]
list7 = [4,5,6]
print(list6 + list7)
print(list7 + list6)
# *
list6 = [1,2,3] * 3
print(list6)
# insert an item
list8 = [4,5,6]
list8.insert(1,9)
print(list8)
# insert items
list8[2:2] = [7,8,9]
print(list8)
# remove items
del list8[0]
print(list8)
del list8[1:3]
print(list8)
# del list8
# print(list8)
# clear()
list8.clear()
print("list8",list8)
|
"""
2021-04-11
quiz 5
Due date by the end of next saturday
"""
"""
q1
b
q2
<class 'int'>
<class 'float'>
<class 'complex'>
"""
# q3
# floating numbers
f = 1.5
print('The data type of f is',type(f))
print(isinstance(f, float))
f = 2.5
print('The data type of y is',type(f))
print(isinstance(f, int))
# integers
a = 10
print('The data type of a is',type(a))
print(isinstance(a, int))
b = 15
print('The data type of a is',type(b))
print(isinstance(b, int))
# complex numbers
b = 2+4j
print('The data type of b is',type(b))
print(isinstance(b, complex))
c = 1+6j
print('The data type of c is',type(c))
print(isinstance(c, complex))
# q4 boolean
a = False
print('The data of a is',type(a))
print(isinstance(b, bool))
# q5
a = 9
print('The data type of a is',type(a))
print(isinstance(a, int))
|
"""
module: datetime
class: timedelta
"""
from datetime import datetime, date
# case1
# 2020-06-01
t1 = date(year=2020, month=6, day=1)
# 2019-06-01
t2 = date(year=2019, month=6, day=1)
dt = t1 - t2
print(f"delta time is {dt}")
# case2
# 2020-06-01
t3 = datetime(year=2020, month=6, day=1, hour=8, minute=10, second=15)
# 2019-06-01
t4 = datetime(year=2019, month=6, day=1, hour=9, minute=15, second=19)
dt2 = t3 - t4
print(f"delta time is {dt2}")
dt3 = t4 - t3
print(f"delta time is {dt3}")
|
"""
place and show two image label
1. png image
2. gif image
"""
from tkinter import *
root = Tk()
root.title("Python GUI - Homework images")
# 16:9
window_width = 1200
window_height = 675
# window centered
screenwidth = root.winfo_screenwidth()
screenheight = root.winfo_screenheight()
x = int(screenwidth/2 - window_width/2)
y = int(screenheight/2 - window_height/2)
root.geometry(f"{window_width}x{window_height}+{x}+{y}")
root.config(bg="saddle brown")
# place an image label - png image
png1 = PhotoImage(file='./Samoyed.png')
text1 = "A .PNG image of a smiley samoyed!!!"
label1 = Label(root, width=1100, height=600,
bg="red4",
# fg="white",
# font="Verdana 12 underline",
relief="solid", image=png1)
label1.pack()
label1_txt = Label(root,
bg="red4",
fg="white",
text = text1,
font="Verdana 12 underline")
label1_txt.pack()
# place an image label - gif image
gif1 = PhotoImage(file='./GIF SAMOYED.gif')
text2="A .GIF image of a smiley samoyed!!!"
label2 = Label(root, width=1100, height=600,
bg="red4",
# fg="white",
# font="Verdana 12 underline",
relief="solid", image=gif1)
label2.pack()
root.mainloop()
|
"""
12. Write a Python program to count the occurrences of each word in a given sentence.
problem: performance
option 1.
remove duplicated items before counting
option 2.
remove duplicated items during counting
"""
"""
plan
1. write sentence
2. split sentence and get the list of word
3. count each word
iterate
4. output
"""
# step 1. write sentence
sentence = """
Public health officials reported 11 new cases of COVID-19 in Ottawa as of Saturday afternoon, a return to the double-digit case numbers that have become the norm in recent weeks.
In total, the nation's capital has had 2,698 confirmed cases of the virus since the start of the pandemic.
Around 86 per cent — or 2,316 — of all cases are now considered resolved, with nine of those being resolved since Friday.
There are 37 fewer active cases in the city compared to last Saturday.
The total number of deaths in Ottawa stands at 264, where it has remained since July 28.
Twelve people remain hospitalized in Ottawa and two people are in intensive care.
There are also three ongoing outbreaks at city institutions such as long-term care facilities and child-care centres.
"""
# clean
# remove punctuations
sentence = sentence.replace('.','')
sentence = sentence.replace(',','')
sentence = sentence.lower()
print(sentence)
# step 2.
# split()
wordlist = sentence.split()
# wordset = set(wordlist)
# wordset = list(wordset)
print(wordlist)
# print(wordlist)
# step3. count
"""
append() - add one item to a list
"""
result = []
wordset = set()
for word in wordlist:
if word not in wordset:
if not word.isnumeric():
wordset.add(word)
wordcount = wordlist.count(word)
# entry = (word, wordcount)
entry = word, wordcount
print(entry, type(entry))
result.append(entry)
# print(result)
# step4. output
# remove duplicated items
# use a dictionary
"""
option 1.
create a dict, then put each item into the dictionary
option 2.
convert to dict
dict()
"""
result.sort()
print(dict(result))
|
"""
file cursor
seek()
tell()
"""
try:
file = open("homework/myweb.html")
content = file.read()
print(content)
print("=================",end="\n")
# read from start
file.seek(0)
content2 = file.read()
print(content2)
print("=================")
file.close()
print("\n\n")
except FileNotFoundError as fe:
print(fe)
except Exception as e:
print(e)
file2 = open("homework/myweb.html")
content = file2.read(4)
print(content)
print("=================",end="\n")
# read from start
file2.seek(9)
content2 = file2.read(4)
print(content2)
print("=================")
file.close()
|
"""
converting oct to dec
converting dec to oct
8^n result
8^0 1
8^1 8
8^2 64
8^3 512
"""
# oct -> dec
c1 = 0o2345
print(c1)
# dec -> oct
d1 = 1253
print(oct(d1))
print(oct(1253))
|
"""
exception handling
else clause
try:
pass
finally:
pass
finally - close resources, release resources
"""
try:
num = int(input("Enter a integer:"))
if num <=0:
raise ValueError("That is not a positive integer")
except ValueError as ve:
print(ve)
finally:
print("this is finally clause")
|
"""
Homework 14
Date: 2021-04-10
Design and write program for a login form
Requirements:
A GUI interface
Preset the username is 'admin' and the password is '123456'
User may input username
User may input password, and the password should show mask char ('*') instead
If the user's input matches the presetting, then the program shows a text message (info) box with the words 'login successfully!'
otherwise, the program shows a text message (error) box with the words 'wrong username or password!'
Due date: by the end of next Friday
"""
from tkinter import *
from tkinter.ttk import Separator
def printInfo():
print(f"You've Account: {accountE.get()}"),
print(f"You've Password: {passwordE.get()}")
root = Tk()
root.title("Python GUI - Entry")
root.geometry("600x430")
user = "Yi"
passw = 123
# Head
digit_label1 = Label(root, text="Login Form",
padx='10', pady='20',
font="Helvetic 30 bold")
digit_label1.pack()
# Separ
sep = Separator(root, orient=HORIZONTAL)
sep.pack(fill=X, padx=5, pady=40)
# Body
accountL = Label(root, text="Account :")
accountL.pack()
passwordL = Label(root, text="Password :")
passwordL.pack()
accountE = Entry(root)
accountE.pack()
passwordE = Entry(root, show='*')
passwordE.pack()
showBtn = Button(root, text='Get Account', command=printInfo)
showBtn.pack()
# Separ
sep = Separator(root, orient=HORIZONTAL)
sep.pack(fill=X, padx=5, pady=40)
# Foot
digit_label3 = Label(root, text="Copyright 2021 Athensoft Inc.",
fg='black', font="30")
digit_label3.pack()
root.mainloop()
|
"""
literal string
"""
str1 = "Hello Python World!"
print(str1)
print("str1 is", str1)
print()
str2 = 'Hello Python World'
print(str2)
print("str2 is", str2)
print()
# please give a name to your website
# www.athensoft.com
website_url = 'www.athensoft.com'
print(website_url)
print()
# www stands for world wide web
# for one character
str3 = 'C'
print(str3)
str3 = "C"
print(str3)
# multiple line string
str4 = """this is a multiple line string"""
print("str4 = ",str4)
str4 = '''this is a multiple
line string'''
print("str4 = ",str4)
# escape character
"""
\n new line
\t tab(able)
\'
\"
\\
"""
print("===n===")
print("===\n----")
print("1,2,3,4,5,6")
print("1,\t2,\t3,\t4,\t5,\t6")
# using \ to print out ", ', \
print("\"")
print('"')
print("'")
print("\'")
print("\\")
# unicode string
# https://en.wikipedia.org/wiki/Unicode
# https://en.wikipedia.org/wiki/List_of_Unicode_characters
str5 = "\u00a9"
print(str5)
str6 = "\u00e9"
print(str6)
|
import re
def is_number(num):
pattern = re.compile(r'^[-+]?[-0-9]\d*\.\d*|[-+]?\.?[0-9]\d*$')
result = pattern.match(num)
if result:
return True
else:
return False
print(is_number(str(-12.0))) |
"""
Homework 11
"""
# 1.
# ?
# Tuples are immutable
# 2.
mylist = [1, 1, 5, 4, 2, 6, 9, 7, 5, 4, 6]
def duplicate(num_list):
for i in num_list:
count = num_list.count(i)
for x in range(count - 1):
num_list.remove(i)
return num_list
print(duplicate(mylist))
# 3.
mylist = []
mylist2 = [1]
def empty_check(list):
if len(list) < 1:
return True
else:
return False
print(empty_check(mylist))
print(empty_check(mylist2))
# 4.
mylist = [1, 2, 3, 4, 5, 6]
mylist2 = []
def clone(list1, list2):
for i in list1:
list2.append(i)
return list2
print(clone(mylist, mylist2))
# 5.
words = 'The quick brown fox jumps over the lazy dog'
words = words.split()
def length_check(list):
word_list = []
for i in list:
if len(i) > 3:
word_list.append(i)
return word_list
print(length_check(words))
|
"""
filter()
mylist1 = [1,2,3,4,5,6,7,8,9,10]
even number
expect result = [2,3,4,8,10]
"""''
mylist1 = [1,2,3,4,5,6,7,8,9,10]
print("The original list is: ",mylist1)
result = []
for i in mylist1:
if i % 2 == 0:
result.append(i)
print("The result is: ", result)
# using lambda function with filter()
print(list(filter(lambda x: x%2 == 0, mylist1)))
|
"""
variable function arguments
"""
"""
output Good morning, your_friend_name!
friend1 = f1
friend2 = f2
friend3 = f3
friend4 = f4
"""
def greeting(words, name):
print("{}, {}!".format(words, name))
# 1st
greeting("Good morning", 'f1')
# 2nd
greeting("Good morning", 'f2')
# 3rd
greeting("Good morning", 'f3')
# 4th
greeting("Good morning", 'f4')
"""
# variable parameter
"""
# positional argument
# keyword argument
# f5,f6,f7,f8,f9
# syntax rule
# all keyword args stay after positional argument
# def greeting1(words="Good morning", name):
def greeting1(name, age=15, words="Good morning"):
# print("{w}, {a}, {n}!".format(w=words, a=age, n=name))
print("{w}, {a}, {n}!".format(n=name, a=age, w=words ))
greeting1('f5')
greeting1('f6')
greeting1('f7')
greeting1('f8')
greeting1('f9',words='Good evening')
greeting1('f9','Good evening')
|
"""
nested for loop
"""
# create a matrix by 3X4
matrix = [
[1,2,3,4],
[5,6,7,8],
[9,10,11,12]
]
for row in matrix:
# print(row)
for item in row:
print(item)
|
"""
rmdir() - remove an empty directory
"""
import os
try:
dirpath = "testdir"
if os.path.exists(dirpath):
os.rmdir(dirpath)
except FileNotFoundError as fe:
print(fe)
except Exception as e:
print(e)
print("done.") |
"""
q3. max number
"""
list1 = [1, 2, 20, 3, 2, 4, 16, 15]
max = list1[0]
for num in list1:
if num > max:
max = num
print("max = ", max)
|
"""
delete/remove element from a list
"""
# 1. del
my_list = ['p','r','o','b','l','e','m']
# remove one element
del my_list[2]
print(my_list)
# remove multiple elements
del my_list[1:5]
print(my_list)
# remove entire list
del my_list[:]
print(my_list)
# del my_list
# print(my_list)
# empty a list
my_list = ['p','r','o','b','l','e','m']
my_list.clear()
print(my_list)
# remove()
my_list = ['p','r','o','b','l','e','m']
my_list.remove('p')
print(my_list)
# my_list.remove('p')
# print(my_list)
my_list = ['p','r','o','p','l','e','m']
my_list.remove('p')
print(my_list)
my_list.remove('p')
print(my_list)
# pop()
my_list = ['p','r','o','p','l','e','m']
my_list.pop(0)
print(my_list)
my_list = ['p','r','o','p','l','e','m']
my_list.pop(3)
print(my_list)
my_list.pop()
print(my_list)
my_list.pop()
print(my_list)
# my_list.pop(30)
# print(my_list)
my_list = ['p','r','o','p','l','e','m']
my_list[2:5] = []
print(my_list) |
"""
catching specific exception
one try block
multiple exception blocks
"""
print("=== start ===")
mylist = ['5','a','0','2','3']
for value in mylist:
try:
result = 1 / int(value)
print(result)
print()
except ValueError:
print("ValueError")
print()
except ZeroDivisionError:
print("ZeroDivisionError")
print()
print("=== end ===")
|
"""
[Homework]
1. Write a Python program to read an entire text file.
2. Write a Python program to read the first n lines of a file.
5. Write a Python program to read a file line by line and store it into a list.
8. Write a python program to find the longest words.
""" |
"""
Locale's appropriate date and time
Format codes %c, %x and %X are used for locale's appropriate date and time representation.
"""
from datetime import datetime
now = datetime.now()
timestamp = now.timestamp()
date_time = datetime.fromtimestamp(timestamp)
d = date_time.strftime("%c")
print("Output 1:", d)
d = date_time.strftime("%x")
print("Output 2:", d)
d = date_time.strftime("%X")
print("Output 3:", d) |
"""
list slicing
"""
mylist = [1,2,3,4,5,6,7,8,9]
# case 1. slicing from the most left
res = mylist[0:5]
print("mylist[0:5]",res)
# 1..5
x = mylist[:5]
print("mylist[:5]",x)
# ex. slicing for 1..8
# leon
# x = mylist[0:7}
# Print(x)
x = mylist[0:8]
print(x)
# youran
my_list = [1, 2, 3, 4, 5, 6, 7, 8, 9]
result = my_list[0:8]
print(result)
# chengjun
res =mylist[0:8]
print(res)
# case 2. slicing from the(any) middle to the end
# from 5..9
res = mylist[4:9]
print("mylist[4:9]",res)
res = mylist[4:len(mylist)]
print("mylist[4:len(mylist)]",res)
res = mylist[4:]
print("mylist[4:]",res)
# res = mylist[4:-1]
# print(res)
# res = mylist[4:0]
# print(res)
# youran
my_list = [1, 2, 3, 4, 5, 6, 7, 8, 9]
middle = round(len(my_list)/2)
result = my_list[middle:len(my_list)]
print(result)
# case 3. slicing
res = mylist[2:7]
print(res)
# ex. slicing for 4..6
# youran
my_list = [1, 2, 3, 4, 5, 6, 7, 8, 9]
result = my_list[3:6]
print(result)
# leon
x = mylist[3:6]
print(x)
# chengjun
res= mylist[3:6]
print(res)
# slicing for all items
res = mylist[:]
print("mylist[:]",res)
print("mylist ",mylist)
|
"""
Assignment operators
assignment expression : from right to left
symbol: =
compared with ==
"""
a = 100
x = y = z = 6
# z = 6
# y = 6
# x = 6
# Compound operator
# 1. arithmetic operator and assignment operator -> compound operator
# 2. bitwise operator and assignment operator -> compound operator
x = 6
x = x + 3
print(x)
# x += 3 # x = x + 3
x = 6
x += 3
print(x)
#
x = 9
# x = x - 3 # please rewrite this statement with compound operator
x -= 3
print(x)
#
x = 6
# x = x * 3 # rewrite it
x *= 3
# performance
x = 8
x /=8
print(x)
|
"""
mini calculator
user can input option (adding, subtracting, mul, div, //, %, **)
to perform arithmetic operation
user can input option (logical and, or, not)
to perform logical operation
after user selected one option of operation, he/she is asked to input operand(s)
The system print out the result with necessary message(prompt)
"""
"""
Hint:
1. one task one function, one function per task
2. consider how to input info for option and operand
3. consider how to output properly
code quality
4. consider the program structure
5. comment
6. naming convention
"""
"""
plan
1. input
2. how to select an option(add,sub,mul or div)
3.
"""
def addition(x,y):
x + y
def subtraction(x,y):
x - y
def multiplication(x,y):
x * y
def division(x,y):
x / y
print("=== Mini calculator ===")
print("Please select an option")
print("1. addition")
print("2. subtraction")
print("3. multiplication")
print("4. division")
while True:
choice = input("Enter choice(1/2/3/4): ")
if choice in ('1', '2', '3', '4'):
x = float(input("Enter first number: "))
y = float(input("Enter second number: "))
if choice == '1':
print(x, "+", y, "=", addition(x , y))
elif choice == '2':
print(x, "-", y, "=", subtraction(x , y))
elif choice == '3':
print(x, "*", y, "=", multiplication(x , y))
elif choice == '4':
print(x, "/", y, "=", division(x , y))
break
else:
print("Invalid")
|
"""
slicing
"""
mylist = ['a','b','c','d','e','f','g','h']
# case 1. from 0..('e')
print(mylist[0:5])
print(mylist[:5])
print()
# case 2. from ('f')..end
print(mylist[5:len(mylist)-1+1])
print(mylist[5:8])
print(mylist[5:-1]) # error
print(mylist[5:])
# case 3. from ('c')..('f')
print(mylist[2:6])
# case 4.
print(mylist[:])
|
"""
"""
def foo():
x = "hi"
x = x * 2
print(x)
x = "global"
foo()
print(x)
# x = "global"
# x = x * 2
# print(x)
# def foo3():
# y = 9
# print("y={}".format(y))
#
# foo3()
# print("y={}".format(y)) |
"""
the full syntax of exception handling
"""
"""
try:
pass
except:
pass
else:
pass
finally:
pass
"""
try:
num = int(input("Input a number:"))
if num <= 0:
raise ValueError(f"invalid literal for positive int with base 10:'{num}'")
except ValueError as ve:
print(ve)
else:
print("Everything fine")
finally:
print("this is finally clause")
try:
num = int(input('Please enter a number:'))
if num <= 0:
raise ValueError('That is not a positive integer')
except ValueError as ve:
print(ve)
else:
print('enter again')
finally:
print('This is finally clause')
"""
try:
pass
except:
pass
finally:
pass
else:
pass
"""
|
from tkinter import *
root = Tk()
root.title("Calculator")
root.geometry("800x500+200+200")
root.config(bg="gray85")
root.resizable(1, 1)
font = ("Helvetica", 16)
expression: str = ""
expression_answer = ""
display_Label = Label(text=expression, width=63, height=3, bg="gray85", relief="raised", padx=5, anchor=E, font=font)
display_Label.grid(columnspan=4, padx=10, pady=10, sticky=E)
def user_input_digit(num):
global expression
num = num - 1
expression = expression + f"{num}"
display_Label.config(text=expression)
def clear():
global expression
expression = ""
display_Label.config(text="")
def delete():
global expression
expression = expression[:-1]
display_Label.config(text=expression)
def modulus():
global expression
if expression[-1:].isnumeric and expression != "":
expression = expression + "%"
display_Label.config(text=expression)
def division():
global expression
if expression[-1:].isnumeric and expression != "":
expression = expression + "/"
display_Label.config(text=expression)
def multiplication():
global expression
if expression[-1:].isnumeric and expression != "":
expression = expression + "*"
display_Label.config(text=expression)
def subtraction():
global expression
if expression[-1:].isnumeric:
expression = expression + "-"
display_Label.config(text=expression)
def addition():
global expression
if expression[-1:].isnumeric and expression != "":
expression = expression + "+"
display_Label.config(text=expression)
def comma():
global expression
if expression[-1:].isnumeric() and expression != "":
expression = expression + "."
display_Label.config(text=expression)
def equal():
global expression, expression_answer
answer = eval(expression)
expression_answer = expression + "\n" + str(answer)
display_Label.config(text=expression_answer)
row = 2
digits = ['7', '4', '1', '8', '5', '2', '9', '6', '3', '0']
clear_button = Button(root, text='C', relief='raised', height=2, width=15, padx=5, pady=5, font='Times 12', fg='blue',
command=clear)
clear_button.grid(row=1)
delete_B = Button(text="DEL", font=font, width=15, height=2, command=delete)
delete_B.grid(row=1, column=1)
modulus_button = Button(root, text='%', relief='raised', height=2, width=15, padx=5, pady=5, font='Times 12',
command=modulus)
modulus_button.grid(row=1, column=2)
division_button = Button(root, text='/', relief='raised', height=2, width=15, padx=5, pady=5, font='Times 12',
command=division)
division_button.grid(row=1, column=3)
multiplication_button = Button(root, text='*', relief='raised', height=2, width=15, padx=5, pady=5, font='Times 12',
command=multiplication)
multiplication_button.grid(row=2, column=3)
subtraction_button = Button(root, text='-', relief='raised', height=2, width=15, padx=5, pady=5, font='Times 12',
command=subtraction)
subtraction_button.grid(row=3, column=3)
addition_button = Button(root, text='+', relief='raised', height=2, width=15, padx=5, pady=5, font='Times 12',
command=addition)
addition_button.grid(row=4, column=3)
answer_button = Button(root, text='=', relief='raised', height=2, width=15, padx=5, pady=5, font='Times 12',
bg='light goldenrod yellow', command=equal)
answer_button.grid(row=5, column=3)
expression = ""
answer = ""
button_list = []
for i in range(10):
button = Button(text=i, command=lambda num=i + 1: user_input_digit(num), width=15, height=2, font=font)
button_list.append(button)
button_list[7].grid(row=2, column=0, pady=5, padx=5)
button_list[8].grid(row=2, column=1, pady=5, padx=5)
button_list[9].grid(row=2, column=2, pady=5, padx=5)
button_list[4].grid(row=3, column=0, pady=5, padx=5)
button_list[5].grid(row=3, column=1, pady=5, padx=5)
button_list[6].grid(row=3, column=2, pady=5, padx=5)
button_list[1].grid(row=4, column=0, pady=5, padx=5)
button_list[2].grid(row=4, column=1, pady=5, padx=5)
button_list[3].grid(row=4, column=2, pady=5, padx=5)
button_list[0].config(width=30)
button_list[0].grid(row=5, columnspan=3, pady=5, padx=(5, 0))
root.mainloop()
|
"""
"""
# create or declare a dictionary
mydict = {
"a":5,
"b":3,
"c":6
}
print(mydict)
#
mydict["d"] = 8
print(mydict)
|
"""
Quiz
Write a program to rename multiple files in a specific directory
date : 2020-11-29
author : Kevin Liu
"""
import os
# instruction of program
print("This program allows you to change rename multiple files in a specific directory.")
#
specified_directory = input("Please enter the full path of the desired directory: ")
# rename file function
def rename_file(file, new_name):
with open(file, "r") as old_file:
content = old_file.readlines()
old_file.close()
with open(new_name, "x") as new_file:
new_file.writelines(content)
os.remove(file)
# all files in specified directory
all_files_directory = list()
dir_list = os.listdir(specified_directory)
print("These are the following files in the specified directory =")
for f in dir_list:
print(f)
# counter
file_num = 0
# main program
while True:
if not os.path.isdir(specified_directory+os.sep+dir_list[file_num]):
print(f"Do you wish to change the name of file {dir_list[file_num]}, y/n")
change = input()
if change == "y":
new_file_name = input("Please enter the new file name, with the extension desired: ")
rename_file(specified_directory+os.sep+dir_list[file_num], new_file_name)
file_num += 1
if file_num == len(dir_list):
break
|
"""
Event binding and handling
button
"""
from tkinter import *
def attack(event):
print('This is a normal attacking action.')
print(event.x,event.y)
root = Tk()
root.title('Python | Event handling')
root.geometry("640x480+200+200")
btn1 = Button(text='My Btn 2')
btn1.pack()
btn1.bind('<Button-1>',attack)
root.mainloop() |
"""
Project 3 v 1.1
"""
global_var = ""
def length_choice():
global global_var
print()
print("Press 1 to convert meters into inches.")
print("Press 2 to convert inches into meters.")
user_choice_1 = int(input("Input your choice: "))
global_var = user_choice_1
def temperature_choice():
global global_var
print()
print("Press 1 to convert celsius into fahrenheit.")
print("Press 2 to convert fahrenheit into celsius.")
user_choice_1 = int(input("Input your choice: "))
global_var = user_choice_1
def weight_choice():
global global_var
print()
print("Press 1 to convert kg into pounds.")
print("Press 2 to convert pounds into kg.")
user_choice_1 = int(input("Input your choice: "))
global_var = user_choice_1
def area_choice():
global global_var
print()
print("Press 1 to convert square meters into acres.")
print("Press 2 to convert acres into square meters.")
user_choice_1 = int(input("Input your choice: "))
global_var = user_choice_1
def water_volume_choice():
global global_var
print()
print("Press 1 to convert gallons into liters.")
print("Press 2 to convert liters into gallons.")
user_choice_1 = int(input("Input your choice: "))
global_var = user_choice_1
def length_converter():
print()
user_input_num = float(input("Please enter the quantity of this item to convert: "))
if global_var == 1:
print(f"If you convert {user_input_num} meters into inches you get {user_input_num * 39.37} inches.")
elif global_var == 2:
print(f"If you convert {user_input_num} inches into meter you get {user_input_num / 39.37} meters.")
def temperature_converter():
print()
user_input_num = float(input("Please enter the quantity of this item to convert: "))
if global_var == 1:
print(
f"If you convert {user_input_num} celsius into fahrenheit you get {user_input_num * 1.8 + 32} fahrenheit.")
elif global_var == 2:
print(
f"If you convert {user_input_num} fahrenheit into celsius you get {(user_input_num - 32) * (5 / 9)} celsius.")
def weight_converter():
print()
user_input_num = float(input("Please enter the quantity of this item to convert: "))
if global_var == 1:
print(f"If you convert {user_input_num} kg into pounds you get {user_input_num * 2.205} pounds.")
elif global_var == 2:
print(f"If you convert {user_input_num} pounds into kg you get {user_input_num / 2.205} kg.")
def area_converter():
print()
user_input_num = float(input("Please enter the quantity of this item to convert: "))
if global_var == 1:
print(f"If you convert {user_input_num} square meters into acres you get {user_input_num / 4047} acres.")
elif global_var == 2:
print(
f"If you convert {user_input_num} acres into square meters you get {user_input_num * 4047} square meters.")
def water_volume_converter():
print()
user_input_num = float(input("Please enter the quantity of this item to convert: "))
if global_var == 1:
print(f"If you convert {user_input_num} gallons into liters you get {user_input_num * 4.546} liters.")
elif global_var == 2:
print(f"If you convert {user_input_num} liters into square gallons you get {user_input_num / 4.546} gallons.")
print("==Converter==")
print("Press 1 to use length converter.")
print("Press 2 to use temperature converter.")
print("Press 3 to use weight converter.")
print("Press 4 to use area converter.")
print("Press 5 to use water volume converter.")
user_input = int(input("Please input the number: "))
if user_input == 1:
length_choice()
length_converter()
elif user_input == 2:
temperature_choice()
temperature_converter()
elif user_input == 3:
weight_choice()
weight_converter()
elif user_input == 4:
area_choice()
area_converter()
elif user_input == 5:
water_volume_choice()
water_volume_converter()
|
mylist = [3, 8, 1, 6, 0, 8, 4]
mylist.pop(1)
mylist.insert(2,1)
target = 8
if target in mylist:
print(mylist.index(target))
else:
print(None)
#
mylist = [3, 8, 1, 6, 0, 8, 4]
indexes = [index for index in range(len(mylist)) if mylist[index] == 8]
print(indexes) |
"""
app: unit converter
ver: 3
author: Yi
"""
def kilometers_miles(x):
s = x * 0.621371
return s
def miles_kilometers(x):
s = x * 1.609344
return s
def fahrenheit_celsius(x):
s = (x - 32) * 5/9
return s
def celsius_fahrenheit(x):
s = (x * 9/5) + 32
return s
def kilogram_pound(x):
s = x * 2.20462
return s
def pound_kilogram(x):
s = x * 0.453592
return s
def meter_foot(x):
s = x * 3.28084
return s
def foot_meter(x):
s = x * 0.3048
return s
def metre_milimetre(x):
s = x * 1000
return s
def milimeter_meter(x):
s = x / 1000
return s
def milimetrecarre_metrecarre(x):
s = x / 10000000
return s
def metrecarre_milimetrecarre(x):
s = x * 10000000
return s
def foot_inch(x):
s = x * 12
return s
def inch_foot(x):
s = x / 12
return s
def inch_cm(x):
s = x * 2.54
return s
def cm_inch(x):
s = x / 2.54
return s
def inch_mm(x):
s = x * 25.4
return s
def mm_inch(x):
s = x / 25.4
return s
def CAD_CNY(x):
s = x * 5.34
return s
def CNY_CAD(x):
s = x / 5.34
return s
f = True
while (f):
print("Converte calculer")
print("0: Exit to the converter")
print("1: Length or distance")
print("2: Temperature")
print("3: Weight")
print("4: Area")
print("5: Currency")
choice = input("choice(0/1/2/3/4/5):")
if choice == "0":
print("Over")
break
elif choice >= "6":
print("this option does not exist.")
continue
elif choice <= "0":
print("this option does not exist.")
continue
if choice =='1':
while True:
print("0: exit to main menu:")
print("1: kilometers to miles:")
print("2: miles to kilometers:")
print("3: metre to milimeter:")
print("4: milimetre to meter:")
print("5: metrecarre to milimetercarre:")
print("6: milimetrecarre to metercarre:")
print("7: foot to inch:")
print("8: inch to foot:")
print("9: inch to cm:")
print("10: cm to inch:")
print("11: inch to mm:")
print("12: mm to inch:")
choice2 = input("choice(0/1/2/3/4/5/6/7/8/9/10/11/12):")
if choice2 =='1':
c = float(input("a number:"))
km2mile = kilometers_miles(c)
print("the number {} * 0.621371 = {}".format(c, km2mile))
if choice2 =='2':
c = float(input("a number:"))
mile2km = miles_kilometers(c)
print("the number {} * 0.1.609344 = {}".format(c, mile2km))
if choice2 =='3':
c = float(input("a number:"))
m2mili = metre_milimetre(c)
print("the number {} * 1000 = {}".format(c, m2mili))
if choice2 == '4':
c = float(input("a number"))
mili2m = milimeter_meter(c)
print("the number {} / 1000 = {}".format(c, mili2m))
if choice2 == '5':
c = float(input("a number:"))
mc2milic = metrecarre_milimetrecarre(c)
print("the number {} * 10000000 = {}".format(c, mc2milic))
if choice2 == '6':
c = float(input("a number:"))
milic2mc = milimetrecarre_metrecarre(c)
print("the number {} / 10000000 = {}".format(c, milic2mc))
if choice2 == '7':
c = float(input("a number:"))
f2i = foot_inch(c)
print("the number {} * 12 = {}".format(c, f2i))
if choice2 == '8':
c = float(input("a number:"))
i2f = inch_foot(c)
print("the number {} / 12 = {}".format(c, i2f))
if choice2 == '9':
c = float(input("a number:"))
i2cm = inch_cm(c)
print("the number {} * 2.54 = {}".format(c, i2cm))
if choice2 == '10':
c = float(input("a number:"))
cm2i = cm_inch(c)
print("the number {} / 2.54 = {}".format(c, cm2i))
if choice2 == '11':
c = float(input("a number:"))
i2mm = inch_mm(c)
print("the number {} * 25.4 = {}".format(c, i2mm))
if choice2 == '12':
c = float(input("a number:"))
mm2i = mm_inch(c)
print("the number {} / 25.4 = {}".format(c, mm2i))
if choice2 == "0":
break
elif choice =='2':
print("0: exit to main menu:")
print("1: fahrenheit_celsius:")
print("2: celsius_fahrenheit:")
choice2 = input("choice(0/1/2):")
if choice2 =='1':
c = float(input("a number:"))
f2c = fahrenheit_celsius(c)
print("the number {} - 32 * 5/9 = {}".format(c, f2c))
if choice2 =='2':
c = float(input("a number:"))
c2f = celsius_fahrenheit(c)
print("the number ({} * 9/5) + 32 = {}".format(c, c2f))
if input == "0":
break
elif choice == '3':
print("0: exit to main menu:")
print("1: kilogram_pound:")
print("2: pound_kilogram:")
choice2 = input("choice(0/1/2):")
if choice2 =='1':
c = float(input("a number:"))
k2p = kilogram_pound(c)
print("the number {} * 2.20462 = {}".format(c, k2p))
if choice2 =='2':
c = float(input("a number:"))
p2k = pound_kilogram(c)
print("the number {} * 0.453592 = {}".format(c, p2k))
if input == "0":
break
elif choice == '4':
print("0: exit to main menu:")
print("1: meter_foot:")
print("2: foot_meter:")
choice2 = input("choice(0/1/2):")
if choice2 =='1':
c = float(input("a number:"))
m2f = meter_foot(c)
print("the number {} * 3.28084 = {}".format(c, m2f))
if choice2 =='2':
c = float(input("a number:"))
f2m = foot_meter(c)
print("the number {} * 0.3048 = {}".format(c, f2m))
if input == "0":
break
elif choice == "5":
print("0: exit to main menu:")
print("1: CAD_CNY")
print("2: CNY_CAD")
choice2 = input("choice(0/1/2):")
if choice2 =='1':
c = float(input("a number:"))
CAD2CNY = CAD_CNY(c)
print("the number {} * 5.34 = {}".format(c, CAD2CNY))
if choice2 =='2':
c = float(input("a number:"))
CNY2CAD = CNY_CAD(c)
print("the number {} / 5.34 = {}".format(c, CNY2CAD))
if input == "0":
break
else:
print("this option does not exist.")
|
"""
python statement
1. Instruction
2. Basic unit of program
"""
# assignment statement
a = 1
# call a function
print("abc")
# if statement
if 3<6:
pass
# for statement
for i in [12,34,45]:
pass
# while statement
while True:
break
# End of a statement
# ;
a = 1;
b = 2;
a = 1
b = 2
# multiple statements stay in one line
a = 1 ; b = 2
# multi-line statement
# one statement which spans multiple lines
# \ - line continuation character
result = 1+ 2+ 3 + 4 + 5 + \
6 + 7 + 8 + 9 + \
10 + 11
print(result)
a = (1, 2, 3, # quarter 1
4, 5, 6, # quarter 2
7, 8, 9) # quarter 3
print(a)
b = {1, 2, 3,
4, 5, 6}
print(b)
c = [1, 2, 3,
4, 5, 6]
print(c)
|
"""
access dictionary value
"""
dict2_en = {
"mon": "Monday",
"tue": "Tuesday",
"wed": "Wednesday",
"thu": "Thursday",
"fri": "Friday",
"sat": "Saturday",
"sun": "Sunday"
}
# access value via key of a dictionary
v_mon = dict2_en["mon"]
print("v_mon is {}".format(v_mon))
|
"""
Project_3
menu 2
"""
"""
km_m
km to meter ?
km to mile ?
"""
# Time
def min_hour(x):
return x / 60
def min_sec(x):
return x * 60
def hour_min(x):
return x * 60
def hour_sec(x):
return x * 3600
def sec_hour(x):
return x / 3600
def sec_min(x):
return x / 60
# Temperature
def celsius_fahrenheit(x):
return (x * 1.8) + 32
def celsius_kelvin(x):
return x + 273.15
def fahrenheit_celsius(x):
return (x - 32) * 1.8
def fahrenheit_kelvin(x):
return (x - 32) * 1.8 + 273.15
def kelvin_celsius(x):
return x - 273.15
def kelvin_fahrenheit(x):
return (x - 273.15) * 1.8 + 32
# Weight
def kg_g(x):
return x * 1000
def kg_pound(x):
return x * 2.205
def g_kg(x):
return x / 1000
def g_pound(x):
return x / 1000 * 2.205
def pound_kg(x):
return x / 2.205
def pound_g(x):
return x / 2.205 * 1000
# Time choice
def time():
print()
print("===Time converter===")
print("Press 1 for minute to hour")
print("Press 2 for minute to second")
print("Press 3 for hour to minute")
print("Press 4 for hour to second")
print("Press 5 for second to hour")
print("Press 6 for second to minute")
choice_2 = int(input("Now please input you choice: "))
if choice_2 == 1:
user_input = float(input("Please input the amount of minutes to convert: "))
print(f"If you convert {user_input} minutes into hours you get {min_hour(user_input)} hours.")
elif choice_2 == 2:
user_input = float(input("Please input the amount of minutes to convert: "))
print(f"If you convert {user_input} minutes into seconds you get {min_sec(user_input)} seconds.")
elif choice_2 == 3:
user_input = float(input("Please input the amount of hours to convert: "))
print(f"If you convert {user_input} hours into minutes you get {hour_min(user_input)} minutes.")
elif choice_2 == 4:
user_input = float(input("Please input the amount of hours to convert: "))
print(f"If you convert {user_input} hours into seconds you get {hour_sec(user_input)} seconds.")
elif choice_2 == 5:
user_input = float(input("Please input the amount of seconds to convert: "))
print(f"If you convert {user_input} seconds into minutes you get {sec_min(user_input)} minutes.")
elif choice_2 == 6:
user_input = float(input("Please input the amount of seconds to convert: "))
print(f"If you convert {user_input} seconds into hours you get {sec_hour(user_input)} hours.")
else:
print("Error")
# Temperature choice
def temperature():
print()
print("===Temperature converter===")
print("Press 1 for celsius to fahrenheit")
print("Press 2 for celsius to kelvin")
print("Press 3 for fahrenheit to celsius")
print("Press 4 for fahrenheit to kelvin")
print("Press 5 for kelvin to celsius")
print("Press 6 for kelvin to fahrenheit")
choice_2 = int(input("Now please input you choice: "))
if choice_2 == 1:
user_input = float(input("Please input the amount of kg to convert: "))
print(
f"If you convert {user_input} celsius into fahrenheit you get {celsius_fahrenheit(user_input)} fahrenheit.")
elif choice_2 == 2:
user_input = float(input("Please input the amount of kg to convert: "))
print(f"If you convert {user_input} celsius into kelvin you get {celsius_kelvin(user_input)} kelvin.")
elif choice_2 == 3:
user_input = float(input("Please input the amount of g to convert: "))
print(f"If you convert {user_input} fahrenheit into celsius you get {fahrenheit_celsius(user_input)} celsius.")
elif choice_2 == 4:
user_input = float(input("Please input the amount of g to convert: "))
print(f"If you convert {user_input} fahrenheit into kelvin you get {fahrenheit_kelvin(user_input)} kelvin.")
elif choice_2 == 5:
user_input = float(input("Please input the amount of pounds to convert: "))
print(f"If you convert {user_input} kelvin into celsius you get {kelvin_celsius(user_input)} celsius.")
elif choice_2 == 6:
user_input = float(input("Please input the amount of pounds to convert: "))
print(f"If you convert {user_input} kelvin into fahrenheit you get {kelvin_fahrenheit(user_input)} fahrenheit.")
else:
print("Error")
# Weight choice
def weight():
print()
print("===Weight converter===")
print("Press 1 for kg to g")
print("Press 2 for kg to pound")
print("Press 3 for g to kg")
print("Press 4 for g to pound")
print("Press 5 for pound to kg")
print("Press 6 for pound to g")
choice_2 = int(input("Now please input you choice: "))
if choice_2 == 1:
user_input = float(input("Please input the amount of kg to convert: "))
print(f"If you convert {user_input} kg into g you get {kg_g(user_input)} g.")
elif choice_2 == 2:
user_input = float(input("Please input the amount of kg to convert: "))
print(f"If you convert {user_input} kg into pounds you get {kg_pound(user_input)} pounds.")
elif choice_2 == 3:
user_input = float(input("Please input the amount of g to convert: "))
print(f"If you convert {user_input} g into kg you get {g_kg(user_input)} kg.")
elif choice_2 == 4:
user_input = float(input("Please input the amount of g to convert: "))
print(f"If you convert {user_input} g into pounds you get {g_pound(user_input)} pounds.")
elif choice_2 == 5:
user_input = float(input("Please input the amount of pounds to convert: "))
print(f"If you convert {user_input} pounds into kg you get {pound_kg(user_input)} kg.")
elif choice_2 == 6:
user_input = float(input("Please input the amount of pounds to convert: "))
print(f"If you convert {user_input} pounds into g you get {pound_kg(user_input)} g.")
else:
print("Error")
print("===Simple Converter===")
print("Press 1 for time conversion")
print("Press 2 for temperature conversion")
print("Press 3 for weight conversion")
choice_1 = int(input("Please input your choice: "))
if choice_1 == 1:
time()
elif choice_1 == 2:
temperature()
elif choice_1 == 3:
weight()
else:
print("Error")
|
"""
string
A string is a sequence of characters.
char = alphabet, digit, symbol, punctuation
immutable
discovery
C - string is not a primitive type
Java - string is reference type
"""
# create a string
str1 = 'hello'
print(str1)
# string v.s. tuple
# immutable, ordered
('h','e','l','l','o')
# use a string as a tuple
# access element (char)
print(str1[0])
print(str1[-1])
# slice
str2 = str1[1:3]
print(str2)
# length
print(len(str1))
print(len(str2))
# change a string
# TypeError: 'str' object does not support item assignment
# str1[0] = 'H' # h -> H
# reassign
str2 = 'abc'
print(str2)
|
"""
String methods - case
Python String capitalize() [yes]
Converts first character to Capital Letter
Python String casefold() [no1]
converts to case folded strings
Python String islower() [yes]
Checks if all Alphabets in a String are Lowercase
Python String isupper() [yes]
returns if all characters are uppercase characters
Python String upper() [yes]
returns uppercased string
Python String lower() [yes]
returns lowercased string
Python String swapcase() [yes]
swap uppercase characters to lowercase; vice versa
Python String title() [yes]
Returns a Title Cased String
"""
# string1 = 'abc'
# print(string1.islower())
#
# string1 = 'ABC'
# print(string1.islower())
def mycase(mystr):
print("1. upper()")
result = mystr.upper()
print(result)
print()
print("2. lower()")
result = mystr.lower()
print(result)
print()
print("4. islower()")
result = mystr.islower()
print(result)
print()
# main
str1 = 'xyZ'
print(f"Original string is {str1}\n")
mycase(str1) |
"""
Homework 9
"""
import random
from py201107.errors import *
randint = random.randint(1, 100)
guess = 0
print("Guess a number between 1 and 100")
for i in range(8):
guess += 1
valid = False
while not valid:
try:
print()
num = int(input("Please enter a number: "))
except ValueError:
print("Invalid characters. Please try again.")
else:
try:
if num < 1:
raise NumberTooSmallError("The number is not in the given range. It should be smaller.")
elif num > 100:
raise NumberTooBigError("The number is not in the given range. It should be bigger.")
except NumberTooBigError as ntb:
print(ntb)
except NumberTooSmallError as nts:
print(nts)
else:
valid = True
if num == randint:
print("Congratulations! You found the right number.")
break
elif guess == 8:
pass
else:
if num < randint:
print("That is not the right number. Please try again. The number is higher.")
else:
print("That is not the right number. Please try again. The number is lower.")
print()
if num != randint:
print(f"Sorry, that was your last chance! The number was {randint}")
|
"""
methods of tuple
count(x) - return occurrence times of x in the tuple
index(x) - return the first occurrence of x in the tuple
index(x, start)
index(x, start, end)
"""
tuple1 = (1,1,2,2,2)
# count(x)
num_1 = tuple1.count(1)
num_2 = tuple1.count(2)
print(num_1)
print(num_2)
print()
# index(x)
pos_1 = tuple1.index(1)
pos_2 = tuple1.index(2)
print(pos_1)
print(pos_2)
# how to find the 2nd item in a tuple
|
"""
dict
create
key: immutable value
number
string
tuple
other immutable type
"""
# create a normal dictionary
dict1 = {
1: 'a',
2: 'b',
3: 'c'
}
print(dict1)
# output {1: 'a', 2: 'b', 3: 'c'}
# question
# one value for one key
# key must be unique
# values are not neccessary different
dict2 = {
1: 'a',
2: 'a',
3: 'a'
}
print(dict2)
# overwriting key-value pair
dict3 ={
1: 'a',
2: 'a',
3: 'a',
3: 'b'
}
print(dict3)
dict3b ={
1: 'a',
2: 'a',
3: 'b',
3: 'a'
}
print(dict3b)
# the case that a key is None
dict4a = {
1: 'a',
2: 'b',
3: 'c',
None: 'no value'
}
print(dict4a)
dict4a2 = {
1: 'a',
2: 'b',
3: 'c',
None: 'no value 1',
None: 'no value 2'
}
print(dict4a2)
# the case that a value is None
dict4b = {
1: 'a',
2: 'b',
3: 'c',
4: None,
5: None
}
print(dict4b) |
"""
Literal collections
A collection is a group of items
1. list
2. tuple
3. set
4. dict (dictionary)
"""
a = 1
b = 2
x = 55
# list
array_odd = [1,3,5,7,9,10]
odd0=1
odd1=3
#
# len()
length = len(array_odd)
print(array_odd)
print('length=',length)
# index - position of item in the list
# index starts from 0
# access element by index
# item, element
print('The #0 item of list is', array_odd[0])
print('The #1 item of list is', array_odd[1])
print('The #2 item of list is', array_odd[2])
print('The #3 item of list is', array_odd[3])
print('The #4 item of list is', array_odd[4])
# update value of item in a list
array_odd[5] = 11
print(array_odd)
a = 1
a = 2
|
"""
list and lambda
"""
mylist = [1,2,3,4,5]
def f(n):
return lambda list1 : list1[n] * 2
result = f(1)
print(result(mylist))
|
"""
[Homework]
Date: 2021-04-10
Design and write program for a login form
Requirements:
A GUI interface
Preset the username is 'admin' and the password is '123456'
User may input username
User may input password, and the password should show mask char ('*') instead
If the user's input matches the presetting, then the program shows a text message (info) box with the words 'login successfully!'
otherwise, the program shows a text message (error) box with the words 'wrong username or password!'
Due date: by the end of next Friday
"""
from tkinter import *
from tkinter import messagebox as msg
root = Tk()
root.title("Python GUI - Entry")
root.geometry("300x160")
def showPwd():
entryobj = passwordE
entryobj['show'] = ''
def hidePwd():
entryobj = passwordE
entryobj['show'] = '*'
def getInfo():
logininfo = accountE.get()
passwordinfo = passwordE.get()
title = 'login information'
if logininfo == username and passwordinfo == password:
text = 'login successfully'
msg.showinfo(title, text)
else:
text = 'wrong username or password!'
msg.showerror(title, text)
username = 'admin'
password = '123456'
accountL = Label(root, text="Account ")
accountL.grid(row=2, padx=(50, 5), sticky='e')
passwordL = Label(root, text="Password ")
passwordL.grid(row=3, padx=(50, 5), sticky='e')
accountE = Entry(root)
accountE.grid(row=2, column=1, padx=(5, 50))
passwordE = Entry(root, show='*')
passwordE.grid(row=3, column=1, padx=(5, 50))
showBtn = Button(root, text='Show password', command=showPwd)
showBtn.grid(row=4, column=1)
showBtn = Button(root, text='Hide password', command=hidePwd)
showBtn.grid(row=5, column=1)
loginbtn = Button(root, text="login", command=getInfo)
loginbtn.grid(row=6, column=1)
root.mainloop()
|
"""
iterating through a tuple
"""
for name in ('John','Kate', 'Peter', 'Jack', 'Kevin'):
print("Hello",name)
|
"""
score
no docstring of comment (-5)
"""
import tkinter
import time
root = tkinter.Tk()
root.title("Homework, Label")
image = False
if image:
root.iconbitmap(image)
w_width = int(input("Please enter the desired width for your widget: "))
w_height = int(input("Please enter the desired height for your widget: "))
sw = root.winfo_screenwidth()
sh = root.winfo_screenheight()
top_left_x = int(sw / 2 - w_width / 2)
top_left_y = int(sh / 2 - w_height / 2)
root.geometry(f"{w_width}x{w_height}+{top_left_x}+{top_left_y}")
# root.configure(background="purple")
# root.configure(bg="purple")
root.config(bg='purple')
root.wm_attributes("-topmost", True)
root.maxsize(1600, 900)
root.minsize(300, 200)
root.resizable(1, 1)
label1 = tkinter.Label(root, text="This is a normal sized label :)", fg="pink", bg="gray", font=12, width=20, height=1)
label1.pack()
label2 = tkinter.Label(root, text="Big Label (:", fg="gold", bg="blue", font=16, width=80, height=20)
label2.pack()
label3 = tkinter.Label(root, text="tiny", fg="white", bg="black", font=5, width=2, height=1)
label3.pack()
label3 = tkinter.Label(root, text="You may resize the window (you have 10 secs), "
"the new dimension will be echoed in console"
, fg="green", bg="pink")
label3.pack()
root.update()
time.sleep(10)
root.update()
print("Your window's width =", root.winfo_width())
print("Your window's height =", root.winfo_height())
root.mainloop()
|
"""
[Homework]
1. Write a Python program to generate and print a dictionary that contains a number (between 1 and n) in the form (x, x*x).
e.g. User inputs 5
Expected Output : {1: 1, 2: 4, 3: 9, 4: 16, 5: 25}
2. Write a program to sort a dictionary by key in both ascending and descending order.
3. Write a program to sort a dictionary by value in both ascending and descending order.
""" |
"""
list sort
"""
# case 1. simple list
mylist = [1,4,3,5,3,5,6,7,8,9,0,2]
mylist.sort()
print(mylist)
# case 2. nested list (matrix)
mylist2 = [[4,'a'],[8,'b'],[2,'c'],[1,'d']]
mylist2.sort()
print(mylist2)
print()
# case 3. sorting by specified column(key)
# solution 1.
# basic idea: let the key be the first one and sort, then set the key back
mylist2 = [[4,'a'],[8,'c'],[2,'b'],[1,'d']]
for i in mylist2:
i.reverse()
print(mylist2)
mylist2.sort()
for i in mylist2:
i.reverse()
print(mylist2)
print()
# solution 2. insert the target key to the first place
# insert
mylist3 = [[4,10,'a',5],[8,9,'c',4],[2,8,'b',3],[1,7,'d',0]]
for item in mylist3:
item.insert(0, item[2])
print(item)
mylist3.sort()
for item in mylist3:
item.pop(0)
print(mylist3)
print()
# solution 3. lambda
mylist4 = [[4,10,'a',5],[8,9,'c',4],[2,8,'b',3],[1,7,'d',0]]
mylist4.sort(key=lambda item: item[2], reverse=True)
print(mylist4) |
"""
isnumeric()
returns True if all characters in a string are numeric characters.
If not, it returns False.
"""
# Example 1
s = '1242323'
print(s.isnumeric())
#s = '²3455'
s = '\u00B23455'
print(s.isnumeric())
# s = '½'
s = '\u00BD'
print(s.isnumeric())
s = '1242323'
s='python12'
print(s.isnumeric()) |
"""
[Homework] 2021-01-06
Read all content from a text file and write them into another file at the same location
to optimize the code to make it safer
"""
try:
# sub-problem 1
file1 = open('datasource.txt')
content = file1.read()
print(content)
# sub-problem 2
file2 = open('datadest.txt','w')
file2.write(content)
except FileNotFoundError as fe:
print(fe)
except IOError as ioe:
print(ioe)
except Exception as e:
print(e)
finally:
file1.close()
file2.close()
|
"""
biggest item in list
"""
list1 = [1, 2, 3, 4, 5]
list1.sort(reverse=True)
print(list1[0])
#
list1 = [1, 2, 3, 4, 5]
list1.sort()
print(list1[-1])
|
"""
dictionary removing elements from a dictionary
pop() - removes an item with the provided key and returns the value
popitem() - can be used to remove and return an arbitrary (key, value) pair
clear() - remove all items
"""
months = {'Jan': 'January',
'Feb': 'February',
'Mar': 'March',
'Apr': 'April',
'May': 'May',
'Jun': 'June',
'Jul': 'July',
'Aug': 'August',
'Sep': 'September',
'Oct': 'October',
'Nov': 'November',
'Dec': 'December'}
# pop()
value = months.pop("Dec")
print(value)
print(months)
# popitem()
item = months.popitem()
print(item, type(item))
# clear()
months.clear()
print(months)
months = {'Jan': 'January',
'Feb': 'February',
'Mar': 'March',
'Apr': 'April',
'May': 'May',
'Jun': 'June',
'Jul': 'July',
'Aug': 'August',
'Sep': 'September',
'Oct': 'October',
'Nov': 'November',
'Dec': 'December'}
# del keywords
# del key,value (item)
# del dict
del months['Oct']
print(months)
del months
# print(months)
# NameError
|
"""
datatype
"""
# numbers
# number - integer
i1 = 1000
print("i1=",i1, type(i1))
print("i2=",123, type(123))
# number - float
f1 = 1.23
print(f1, type(f1))
print(f1, type(1.23))
# string
s1 = "abc"
print(s1, type(s1))
# string, str
# boolean
b1 = True
b2 = False
print(b1, type(b1))
print(b2, type(b2))
# boolean, bool
|
"""
literal - string
is a sequence of characters surrounded by quotes.
"""
# string literal
str1 = 'abc'
str2 = "abc"
str3 = 'C'
str4 = 'c'
str5 = '&'
print(str3, str4, str5)
multiline_str = """This is a multiline string with
more than one line code."""
print(multiline_str)
print()
multiline_str2 = '''This is a multiline string
with more than one line code.'''
print(multiline_str2)
|
"""
Test user-defined errors
"""
# user input a number from a keyboard
# if it is > 100, then raise an error
# if it is < 1, then raise an error also
import sj200917_python2m6.day09_201112.myerrors as err
print("Please enter a number from 1 to 100: ", end="")
num = int(input())
try:
if num> 100:
raise err.TooBigError
elif num < 1:
raise err.TooSmallError
except err.TooBigError as tbe:
print("Too big! please input a number which is less than 100.")
except err.TooSmallError as tse:
print("Too small! please input a number which is greater than 1.")
except Exception as e:
print(e)
print("continue to execute.")
|
"""
dictionary Counter
"""
# candidate 1, 2
# vote by state
# candidate1
# A state : 50
# B state : 45
# C state : 70
# candidate2
# A state : 60
# B state : 50
# C state : 40
from collections import Counter
# import collections
# state A
vote_state_a = {
'c1' : 50,
'c2' : 60
}
# state B
vote_state_b = {
'c1' : 45,
'c2' : 50
}
# state C
vote_state_c = {
'c1' : 70,
'c2' : 40
}
# calculate number of ticket for every candidate
result = Counter(vote_state_a) + Counter(vote_state_b) + Counter(vote_state_c)
print(result)
result = dict(result)
print()
# trail
result = Counter(vote_state_a) - Counter(vote_state_b)
print(result)
|
"""
Tkinter
using grid layout
grid()
rowspan, columnspan
merge cells
"""
from tkinter import *
root = Tk()
root.geometry('320x240+200+200')
root.config(bg='#ddddff')
# create label widgets
label1 = Label(root, text='Label 0,0',bg='yellow')
label2 = Label(root, text='Label 0,1')
label3 = Label(root, text='Label 1,1')
# show on screen
label1.grid(row=0, column=0, columnspan=2)
label2.grid(row=1, column=0)
label3.grid(row=1, column=1)
root.mainloop() |
"""
[Homework] 2021-01-23
Create your own window
requirements:
1. make it at center point on your screen
2. specify dimension at 16:9
3. set a background color
4. make it topmost
5. make it non-resizable
6. print out the window's height and width at console
Due date: by the end of next Friday
"""
import tkinter as tk
import time
root = tk.Tk()
root.title("Python GUI - Center")
# root.iconbitmap("IMG_2408.ico")
width = 640
height = 480
rightpos = int(root.winfo_screenwidth() / 2 - width/2 )
downpos = int(root.winfo_screenheight() / 2 - height/2 )
root.maxsize(900, 600)
root.minsize(100, 70)
root.geometry(f"{width}x{height}+{rightpos}+{downpos}")
root.update()
time.sleep(1)
root.update()
root.configure()
time.sleep(1)
root.update()
root.configure()
time.sleep(1)
root.update()
root.configure() |
"""
[Homework]
Date: 2021-03-08
1. Write a GUI program of clock
Requirements:
(Function)
Show current time in the pattern of HH:mm:ss.aaa
i.e.
10:12:45.369
(UI)
Display a title, main area for clock, and footer for the date
Due date: by the end of next Friday
Hint:
import datetime
strftime
"""
"""
score:
footer, improper size of font (-2)
"""
from tkinter import *
from tkinter.ttk import Separator
import datetime
def count():
clock_label.config(text=datetime.datetime.now().strftime("%H:%M:%S.%f")[:-3])
clock_label.after(1, count)
# main program
root = Tk()
root.title('Python GUI - Label clock')
root.geometry("{}x{}+200+240".format(640, 540))
root.configure(bg='#ddddff')
# title label object
label1 = Label(root, text="Label Clock", bg="blue", fg="white", height=2, width=100, font="Helvetic 35 bold")
label1.pack()
# separator
sep1 = Separator(root, orient=HORIZONTAL)
sep1.pack(fill=X)
# clock label object
clock_label = Label(root,
bg="seagreen",
fg='white',
height=8,
width=100,
font="Helvetic 30 bold")
clock_label.pack()
# separator
sep1 = Separator(root, orient=HORIZONTAL)
sep1.pack(fill=X)
# footer label object
label2 = Label(root, text="Version 1 | Ze Yue Li | 2021-03-08", bg="red", fg="white", height=2, width=100, font="Helvetic 35 bold")
label2.pack()
count()
root.mainloop()
|
"""
[Homework]
Date: 2021-07-29
please write a program to get the product of
1x2x3x4x5x6x7x8x9x10
hints:
for-loop
"""
# sum = 1
#
# for i in range(1, 11):
# sum = sum * i
#
# print(sum)
product = 1
for i in range(1, 11):
product = product * i
print(product)
|
def OR(num_1, num_2):
return num_1 or num_2
print(OR((float(input('Please enter the or:')),float(input('Please enter the other or:'))))) |
"""
change value(s) of items from a list
"""
odd = [2, 4, 6, 8]
# update value
odd[0] = 1
print(odd)
# update multiple items at one time
odd[1:4] = [3,5,7]
print(odd)
|
"""
Printing out a which is 3x4 so 3 rows and 4 columns
"""
a = [
["Magic", "Nothing", "Hello", "Crocodile"],
[1, 2, 3, 4],
["Simple", "Math", "French", "Science"]
]
print(a) # printing the entire matrix
print(a[0]) # printing the first row of the matrix
print(a[0][2]) # printing the element "Hello" from the matrix
print(a[1][1]) # printing the element 2 from the matrix
|
"""
3 step to operate on a file
step 1. Open a file
step 2. Read/Write (perform operation)
step 3. Close the file
"""
# open()
try:
file = open('text1.txt1')
print(file)
except FileNotFoundError as fe:
print(fe)
|
"""
String formatting
print()
format()
with named parameter
"""
width = 2560
height = 1600
# solution 2
print("My screen resolution is {0} x {1}".format(width, height))
# solution 3.
# your code goes here
# Andy
print('My screen resolution is {my_width} x {my_height}'.format(my_width=width, my_height=height))
# Leonj
print('my screen resolution is {my_width} x {my_height}'.format(my_width=width, my_height=height))
# Yiding
print('my screen resolution is {my_width} x {my_height}'.format(my_width=width, my_height=height))
# Kevin
width = 2560
height = 1600
# solution 2
print("My screen resolution is {0} x {1}".format(width, height))
# solution 3
print("My screen resolution is {my_width} x {my_height}".format(my_width=width, my_height=height))
print("My screen resolution is {width} x {height}".format(width=width, height=height))
|
"""
[Homework]
Date: 2021-02-06
1. Try out label widget
Description:
- create a window based on previous homework
- set icon, title, dimension, maxsize, minsize, bg and any other options for the window as much as you know
- create a text Label
"""
import tkinter as tk
import time
root = tk.Tk()
root.title("Christmas Tree")
root.iconbitmap("./Tree.ico")
window_width = 1200
window_height = 600
screenwidth = root.winfo_screenwidth()
screenheight = root.winfo_screenheight()
x = int(screenwidth/2 - window_width/2)
y = int(screenheight/2 - window_height/2)
root.geometry(f"{window_width}x{window_height}+{x}+{y}")
root.maxsize(1600, 900)
root.minsize(320, 180)
root.resizable(1, 1)
my_label = tk.Label(root, text="Please do not close this window before it becomes black!", width=100, height=3, bg="white", fg="cyan3", anchor="e", font="Gabriola 18 italic")
my_label.pack()
my_label = tk.Label(root, text="Thanks!", width=60, height=4, bg="red", fg="orange", anchor="se", font="Times 15 underline")
my_label.pack()
my_label = tk.Label(root, text="Have a wonderful day!", width=45, height=4, bg="green", fg="lime", anchor="w", font="Algerian 20 bold italic")
my_label.pack()
my_label = tk.Label(root, text="See you next time.", width=60, height=5, bg="blue", fg="yellow", anchor=tk.NW, font='"Courier New" 18 bold')
my_label.pack()
my_btn = tk.Button(root, text="Close", width=15, height=2, bg="brown", font="Harrington 15 bold overstrike", command=root.destroy)
my_btn.pack()
root.attributes("-topmost", True)
root.config(bg="black")
root.update()
time.sleep(1.5)
root.config(bg="coral1")
root.update()
time.sleep(1.5)
root.config(bg="coral2")
root.update()
time.sleep(1.5)
root.config(bg="coral3")
root.update()
time.sleep(1.5)
root.config(bg="PaleVioletRed1")
root.update()
time.sleep(1.5)
root.config(bg="PaleVioletRed2")
root.update()
time.sleep(1.5)
root.config(bg="PaleVioletRed3")
root.update()
time.sleep(1.5)
root.config(bg="MediumPurple1")
root.update()
time.sleep(1.5)
root.config(bg="MediumPurple2")
root.update()
time.sleep(1.5)
root.config(bg="MediumPurple3")
root.update()
time.sleep(1.5)
root.config(bg="black")
root.update()
time.sleep(3)
root.iconify()
root.mainloop()
|
"""
how to validate the number and make it within your upper and lower bound
"""
"""
x = int(input("enter a number (1-100):"))
if x > 100 or x <1:
print("Warning: Please input a valid number!")
else:
print("Your input is {}".format(x))
"""
# Leon - do-while v.s. while
def inputValidNumber():
x = ''
while True:
x = int(input("enter a number (1-100):"))
if x > 100 or x < 1:
print("Warning: Please input a valid number!")
else:
print("Your input is {}".format(x))
break
return x
inputValidNumber() |
"""
Ze Yue Li
7/7/2020
Exercises on Dictionary
1. Write a Python script to sort (ascending and descending) a dictionary by value.
2. Write a Python script to add a key to a dictionary.
Sample Dictionary : {0: 10, 1: 20}
Expected Result : {0: 10, 1: 20, 2: 30}
3. Write a Python script to concatenate following dictionaries to create a new one.
Sample Dictionary :
dic1={1:10, 2:20}
dic2={3:30, 4:40}
dic3={5:50,6:60}
Expected Result : {1: 10, 2: 20, 3: 30, 4: 40, 5: 50, 6: 60}
4. Write a Python script to check whether a given key already exists in a dictionary.
5. Write a Python program to iterate over dictionaries using for loops.
6. Write a Python script to generate and print a dictionary that contains a number (between 1 and n) in the form (x, x*x).
Sample Dictionary ( n = 5) :
Expected Output : {1: 1, 2: 4, 3: 9, 4: 16, 5: 25}
"""
# Question 1
my_dict = {'a': 37, 'b': 45, 'c': 39}
list1 = []
for i in list(my_dict):
list1.append(my_dict[i])
list2 = sorted(list1)
print(list2)
dict2 = {'1': list2[0], '2': list2[1], '3': list2[2]}
print(dict2)
my_dict = {'a': 37, 'b': 45, 'c': 39}
list1 = []
for i in list(my_dict):
list1.append(my_dict[i])
list2 = sorted(list1, reverse=True)
print(list2)
dict2 = {'1': list2[0], '2': list2[1], '3': list2[2]}
print(dict2)
# Question 2
my_dict = {1: 10, 2: 20}
my_dict[3] = 30
print(my_dict)
# Question 3
dict1 = {1:10, 2:20}
dict2 = {3:30, 4:40}
dict3 = {5:50, 6:60}
dict4 = {}
for i in list(dict1):
dict4[i] = dict1[i]
for i in list(dict2):
dict4[i] = dict2[i]
for i in list(dict3):
dict4[i] = dict3[i]
print(dict4)
# Question 4
dict3 = {5:50, 6:60}
print(5 in dict3)
# Question 5
dict3 = {5:50, 6:60, 7:70, 8:80, 9:90}
for i in dict3:
print(i, dict3[i])
# Question 6
num = 5
dict1 = {}
for i in range(1, num+1):
dict1[i] = i*i
print(dict1) |
"""
Symmetric difference
(A - B) | (B - A)
"""
# initialize A and B
A = {1, 2, 3, 4, 5}
B = {4, 5, 6, 7, 8}
result = A.symmetric_difference(B)
result2 = B.symmetric_difference(A)
print(result)
print(result2)
# solution2
result3 = (A - B) | (B - A)
print(result3)
|
"""
q3
"""
total_score = 0
average = 0
a_num = 0
scores = [85, 78, 96, 85, 73, 59, 45, 97, 89, 90]
num_people = len(scores)
for num in scores:
total_score = total_score + num
if num >= 90:
a_num += 1
average = total_score / num_people
print("Average score is {:.1f}".format(average))
print("{} students of {} students got A.".format(a_num,num_people)) |
"""
anchor of Label widget
anchor = n, s, w, e, ne, nw, se, sw, center
"""
import tkinter as tk
root = tk.Tk()
root.title('Python GUI - Label')
winw= 640
winh= 480
posx=300
posy=200
root.geometry(f'{winw}x{winh}+{posx}+{posy}')
root.config(bg='#ddddff')
# create a Label
label1 = tk.Label(root, text='My Text Label', width=50, height=3, anchor='nw')
label1.pack()
# create a Label
label2 = tk.Label(root, text='My Text Label 2',width=30, height=5, anchor=tk.NW)
label2.pack()
root.mainloop() |
"""
creating dictionary based on other dictionary
"""
# case 1. literal of dictionary
# dict()
my_dict = dict({1:'apple', 2:'orange'})
print(my_dict)
# case 2. compatible data structure
my_dict = dict([[3,'apple'],[4,'orange']])
print(my_dict)
|
"""
list comprehension
"""
# case 1.
# [1,2,3,4,5] get a new list by doubling each item
mylist = [1,2,3,4,5]
# solution 1. for-loop
newlist = []
for i in mylist:
newlist.append(i*2)
print(newlist)
# solution 2. map()
newlist = list(map(lambda item: 2*item, mylist))
print(newlist)
# solution 3. list comprehension
newlist = [x * 2 for x in mylist]
print(newlist)
# case 2. list comprehension and filter
# for, if, []
# [1,3,5,7,9]
newlist2 = [x for x in range(1,11)]
print(newlist2)
newlist2 = [x for x in range(1,11) if x % 2 == 1]
print(newlist2)
|
"""
Homework
"""
"""
score
perfect
"""
from tkinter import *
root = Tk()
root.title("Python GUI - Homework")
win_width = 640
win_height = 480
positionRight = int(root.winfo_screenwidth() / 2 - win_width/2 )
positionDown = int(root.winfo_screenheight() / 2 - win_height/2 )
root.maxsize(900, 600)
root.minsize(100, 70)
root.geometry(f"{win_width}x{win_height}+{positionRight}+{positionDown}")
mytext = 'MyText Label 6'
label1 = Label(root, text=mytext,
width=30, height=7,
bg='blue', fg='#ffffff',
anchor=N)
lable2 = Label(root,bg = 'green',bitmap = 'info', padx = 20, pady = 10)
label1.pack()
lable2.pack()
root.update()
root.configure(bg='#ffdddd')
# create a label with image in .gif
bgimg = PhotoImage(file='./img/pimon.gif')
label3 = Label(root, image=bgimg)
# center on screen
label3.pack()
root.mainloop() |
"""
[Homework]
2021-02-28
Show and Hide a label in a window
Due date: By the end of next Sat.
"""
"""
score:
one minor logic defect (-5)
"""
from tkinter import *
def hide(widget):
return lambda: Pack.forget(widget)
def show(widget):
return lambda: widget.pack(side=LEFT)
root = Tk()
root.title("Python GUI - Homework")
root.geometry("640x480+0+0")
label1 = Label(root, text='label_A', font=('Time', 20), fg='black', bg="#F0F0EC")
label2 = Label(root, text='Label_B', font=('Time', 20), bg='yellow')
label3 = Label(root, text='Label_C', font=('Time', 20), fg='white', bg='#83b5dd')
label1.pack(side=LEFT)
label2.pack(side=LEFT)
label3.pack(side=LEFT)
label1.after(2000, hide(label1))
label1.after(2000, show(label1))
root.mainloop()
|
str1 = "The quick brown fox jumps over the lazy dog"
dumb = str1.split()
yet = int(input("Please input a number:"))
str2 = []
for i in dumb:
if len(i) > yet:
str2.append(i)
print(str2)
|
"""
float number
decimal point
"""
f1 = 1.5
f2 = -1.56
# type()
print(type(f1), f1)
d1 = 100
print(type(d1), d1)
# scientific
s1 = 15000000000
# s1 = 1.5X10^10
s1 = 1.5e10
print(s1)
s2 = 15
s2 = 1.5e1
print(s2)
print(int(s2))
s3 = 0.15
s3 = 1.5e-1
print(s3)
s4 = 0.0015
s4 = 1.5e-3
print(s4)
|
"""
2. Write a Python function that takes two lists and returns True
if they have at least one common member.
"""
# create two lists
list1 = ['x','2','c']
list2 = ['a','2','3']
#
for item in list1:
result = item in list2
if result:
print(f'the common member is {item}')
break
|
"""
2021-03-21
Create a set with 8 items
A story or topic must be applied as you did with list in class
Create a dictionary with 8 pairs of key and value
A story or topic must be applied as you did with list in class
"""
instrument_dict = {1: 'trumpet', 2: 'trombone', 3: 'guitar', 4: 'sax', 5: 'clarinet', 6: 'bass', 7: 'tuba', 8: 'flute'}
print(type(instrument_dict))
print(instrument_dict)
num = len(instrument_dict)
print("there are", num, "instrument in the dictionary") |
"""
list method
index()
"""
# student list of last year
stulist = [101,102,103,104,201,202,203,204,205,301,302,303,304]
# get the position of student 201 in the list
stu_no = 201
print("The student {} is at stulist[{}]".format(stu_no,stulist.index(stu_no)))
# get the position of student 201 in the list
stu_no = 301
print("The student {} is at stulist[{}]".format(stu_no,stulist.index(stu_no)))
stulist = [101,102,103,104,201,202,203,204,205,301,302,303,304,101,102,103,104,201,202,203,204,205,301,302,303,304]
# get the index of 2nd item of 201
stu_no = 201
current_index = stulist.index(stu_no)
print("The 1st student {} is at stulist[{}]".format(stu_no,current_index))
print("The 2nd student {} is at stulist[{}]".format(stu_no,stulist.index(stu_no,current_index+1))) |
"""
Number guessing AI v1.1
Ze Yue Li
2020-06-27
猜数字的AI
和猜数字一样，不过这次是设计一个能猜数字的AI
功能描述： 用户输入一个单位以内的数字，AI要用最少的次数猜中，并且显示出猜的次数和数字。
"""
def input_num(message, smallerthan=-1, greaterthan=0):
num = input(message)
while not num.isdigit():
num = input(message)
while int(num) < greaterthan or int(num) > smallerthan > -1:
num = input(message)
while not num.isdigit():
num = input(message)
return num
def possible_nums(num_range):
pos_nums = []
for i in range(num_range[0], num_range[1] + 1):
pos_nums.append(i)
return pos_nums
def guess(pos_nums, num_to_guess):
guess = pos_nums[len(pos_nums) // 2]
guesses = 1
while guess != num_to_guess:
guesses += 1
if guess > num_to_guess:
pos_nums2 = pos_nums.copy()
pos_nums.clear()
for i in range(pos_nums2[0], guess):
pos_nums.append(i)
else:
pos_nums2 = pos_nums.copy()
pos_nums.clear()
for i in range(guess + 1, pos_nums2[-1] + 1):
pos_nums.append(i)
guess = pos_nums[len(pos_nums) // 2]
print(guess)
print('The AI guessed {} times'.format(guesses))
num_to_guess = int(input_num('Input an integer for the computer to guess:'))
num_range_start = input_num("Input the first number of a range covering your number:", num_to_guess)
num_range_end = input_num("Input the second number of the range", -1, num_to_guess)
num_range = [int(num_range_start), int(num_range_end)]
pos_nums = possible_nums(num_range)
guess(pos_nums, num_to_guess)
|
"""
Homework 10
"""
import random
normal = 0
magic = 0
rare = 0
legendary = 0
ancient_legendary = 0
for i in range(1000):
chance = random.randint(1, 1000)
if chance in range(1, 638):
print('normal')
normal += 1
elif chance in range(639, 888):
print('magic')
magic += 1
elif chance in range(889, 988):
print('rare')
rare += 1
elif chance in range(989, 998):
print('legendary')
legendary += 1
elif chance in range(999, 1000):
print('ancient legendary')
ancient_legendary += 1
print(f'normal: {normal}, magic: {magic}, rare: {rare}, legendary: {legendary}, ancient legendary: {ancient_legendary}')
|
"""
Number Formatting Types
Type Meaning
d Decimal integer
c Corresponding Unicode character
b Binary format
o Octal format
x Hexadecimal format (lower case)
X Hexadecimal format (upper case)
n Same as 'd'. Except it uses current locale setting for number separator
e Exponential notation. (lowercase e)
E Exponential notation (uppercase E)
f Displays fixed point number (Default: 6)
F Same as 'f'. Except displays 'inf' as 'INF' and 'nan' as 'NAN'
g General format. Rounds number to p significant digits. (Default precision: 6)
G Same as 'g'. Except switches to 'E' if the number is large.
% Percentage. Multiples by 100 and puts % at the end.
"""
# d
n = 123
print("The number is {:d}".format(n))
# n = 123.45
# print("The number is {:d}".format(n))
# c
# char = u'\u0039'
# print("The character is {:c}".format(char))
char = 65
print("The character is {:c}".format(char))
char = 97
print("The character is {:c}".format(char))
# b
b = 101
print("The number is 0b{:b}".format(b))
b1 = 0b1100101
b1 = bin(b)
# o
o = 0x10
print("The number is 0o{:o} >>>".format(o))
# x
x = 246
print("The number is 0x{:x}".format(x))
x_uppercase = 76
print("The number is 0x{:X}".format(x_uppercase))
# n
n = 12300000
print("The number is {:n}".format(n))
n = 134596
print("The number is {:n}".format(n))
e = 81
print("The number is {:e}".format(e))
e = 81
print("The number is {:E}".format(e))
# f
f = 2378.32556234
print("The number is {:F}".format(f))
# g
g = 1895.8923456
print("The number is {:g}".format(g))
g = 319.347721949
print("The number is {:G}".format(g))
# %
percentage = 0.178
print("The percentage is {:.2%}".format(percentage))
|
"""
Final exam part II - Issa
1. Writing a GUI program in Python tkinter for the registration process of a network application.
Basic requirements:
a. User can input a username --> done
b. User can input a password --> done
c. User can input a password for the second time to ensure user's password was input correctly --> done
d. User can input a validation code (usually an integer) generated randomly by the System, and that code (or number) should display on the window. If the user inputs the wrong code (or number), registration will fail and a messagebox should popup on the screen to warn the user. --> done
e. A text title for this application should be set properly on the interface. Note: It is not the title of the main window. --> done
f. A Button is required to perform registration once User finishes all inputs. Proper messages or information is required to display in both cases of 'success' and 'failed'. --> done
g. A second Button is required to perform reset (or clear all inputs on the window) --> done
h. Another Button is required to perform closing window and exit --> done
Hints:
Any layout manager is free to use.
To make a clean and concise layout for your GUI application.
Make a wireframe (or draft design) for your GUI
Assuming your application (program) is designed for a real scenario, therefore think about what previous experience you had in other online registration processes.
"""
from tkinter import *
from tkinter import messagebox as msg
import random
def login():
if entry2.get() == entry3.get() and code == entry4.get():
msg.showinfo("Form Result", "Login successfully.")
else:
msg.showerror("Form Result", "Wrong password, username or validation code. Please try again.")
def clearInfo():
entry1.delete(0, END)
entry2.delete(0, END)
entry3.delete(0, END)
entry4.delete(0, END)
root = Tk()
root.title("Form")
root.geometry("500x500")
root.configure(bg="black")
root.iconbitmap("./img/login.ico")
code = str(random.randint(1000, 9999))
# title
title = Label(root, text="Account Registration", bg="black", fg="white", font="verdana 24")
title.pack(anchor=CENTER)
blank_space_0 = Label(root, bg="black")
blank_space_0.pack()
# entry of account
accountL = Label(root, text="Account:", bg="black", fg="white")
accountL.pack()
entry1 = Entry(root)
entry1.pack()
blank_space = Label(root, bg="black")
blank_space.pack()
# entry of password
passwordL = Label(root, text="Password:", bg="black", fg="white")
passwordL.pack()
entry2 = Entry(root, show="*")
entry2.pack()
blank_space_2 = Label(root, bg="black")
blank_space_2.pack()
# entry of password 2
password2L = Label(root, text="Confirm password:", bg="black", fg="white")
password2L.pack()
entry3 = Entry(root, show="*")
entry3.pack()
blank_space_3 = Label(root, bg="black")
blank_space_3.pack()
# validation code
validation_code = Label(root, text=f"Your validation code: {code}", bg="black", fg="white", font="verdana 12")
validation_code.pack(anchor=CENTER)
confirm_code = Label(root, text="Confirm validation code:", bg="black", fg="white")
confirm_code.pack()
# entry of validation code
entry4 = Entry(root)
entry4.pack()
blank_space_4 = Label(root, bg="black")
blank_space_4.pack()
# button of login
login_btn = Button(root, text='Login', command=login, bg="white", fg="black")
login_btn.pack()
blank_space_5 = Label(root, bg="black")
blank_space_5.pack()
# button of clear
clear_btn = Button(root, text="Clear", bg="white", fg="black", command=clearInfo)
clear_btn.pack()
blank_space_5 = Label(root, bg="black")
blank_space_5.pack()
# button of exit
quit_btn = Button(root, text="Exit", bg="white", fg="black", command=root.destroy)
quit_btn.pack()
root.mainloop()
|
"""
generate list
combing or repeating
"""
# + operator
list1 = [1,2,3]
list2 = [4,5,6]
newlist = list1 + list2
print(newlist)
newlist = list2 + list1
print(newlist)
#
old_students = ['name1', 'name2', 'name3', 'name4', 'name5', 'name6', 'name7', 'name8']
new_students = ['nm1','nm2','nm3']
namelist = old_students + new_students
print(namelist)
#
old_students = ['name1', 'name2', 'name3', 'name4', 'name5', 'name6', 'name7', 'name8']
new_students = ['nm1','nm2','nm3']
for new in new_students:
old_students.append(new)
print(old_students)
# repeating a list
# * operator
list1 = [1,2,3]
newlist = list1 * 3
print(newlist)
newlist = list1 * 0
print(newlist)
newlist = list1 * -1
print(newlist)
|
"""
score
not executable (-35)
missing docstring of comment (-5)
not enough white spaces (-1)
"""
import tkinter
import time
print("This program will create a widget of specified size."
" After, it is going to resize it to 500x350, then ending the program")
root = tkinter.Tk()
# window title
root.title("stem1403_ccj")
image = False
if image:
root.iconbitmap(image)
print("enter a 16:9 ratio dimension for your widget, ")
w_width = int(input("enter the desired width for your widget: "))
w_height = int(input(" enter the desired height for your widget: "))
while w_width/w_height != 16/9 or w_width > 1600 or w_height > 900:
print("Please enter a 16:9 ratio dimension for your widget (ex: 1600x900 or 800x450, etc...)"
"\nMust be equal or smaller than 1600x900")
w_width = int(input("Please enter the desired width for your widget: "))
w_height = int(input("Please enter the desired height for your widget: "))
sw = root.winfo_screenwidth()
sh = root.winfo_screenheight()
top_left_x = int(sw/2 - w_width/2)
top_left_y = int(sh/2 - w_height/2)
root.geometry(f"{w_width}x{w_height}+{top_left_x}+{top_left_y}")
root.configure(background="bleu")
root.wm_attributes("-topmost", True)
root.maxsize(1600, 900)
root.minsize(300, 200)
root.resizable(1, 1)
root.update()
print(root.winfo_width(), "= initial width")
print(root.winfo_height(), "= initial height")
time.sleep(2)
w_width = 500
w_height = 350
top_left_x = int(sw/2 - w_width/2)
top_left_y = int(sh/2 - w_height/2)
root.geometry(f"{w_width}x{w_height}+{top_left_x}+{top_left_y}")
root.update()
|
"""
show an .gif image without any gap
"""
from tkinter import *
root = Tk()
root.title('Python GUI - Label image')
root.config(bg='#ddddff')
# step 1. create an object of PhotoImage
photo_obj = PhotoImage(file='img/pimon.gif')
# step 2.
label1 = Label(root, image=photo_obj)
# step 3. place label with image into window
label1.pack()
root.mainloop() |
"""
string1 = 'ab'
string2 = 'xy'
['ax','ay','bx','by']
"""
string1 = 'ab'
string2 = 'xy'
# solution 1
result = []
for c1 in string1:
# print(c1)
for c2 in string2:
# print(c2)
# print(c1, c2)
print(c1+c2)
result.append(c1+c2)
print(result)
print("=================")
# solution 2
result = [[c1+c2 for c1 in string1] for c2 in string2]
print(result)
result = [c1+c2 for c1 in string1 for c2 in string2]
print(result) |
"""
1. List can make some change. And Tuple can't make change. So Tuple is safer than List, and list is very convenient.
(missing: ordered, collection of items)
2. Set is mutable, But items in set are immutable. And all items in set are unique.
Also, all items in dictionary are unique, but dictionary have 2 Column, so like this can enter the price of the product to use dictionary.
(missing: when to use)
3. No, because some float in python can have some deviation, like I know this two are equal, but python say it is not equal.
4. Lambda function is very easy to uss, because the syntax of lambda function is easy than normal.
But we can use just only one times, so we don't need to write for names. Last one, we can pass function as an argument.
5. Multi-module program is have many python file, so I can write one part in one python document. SO I think we can just use it in one small program.
Multi-package program is have many python package, so I can write one part in one python packages, in one part, I write some programs in this parts.
And I Think multi-package program is better for one teams.
6. Recursive function:
def example(condition):
if condition == 1:
result = True
else:
result = False
return result
print(example(1))
We use return to return the answer.
Drawbacks: If we use recursive function to do one big question mathematic, like the result of 80th number of Fibonacci,
use the recursive function to know this result is very slow.
(wrong example)
7. We can makes some note in the program, like use #, and you can write : a is for all apple's number.
(missing: using variables or constants)
8. I think: The syntax of your program and the syntax of your statement to output. Can be readable, understandable,
because this is very important for teamwork, so, if it isn't understandable, your teams can't understand the program you
wrote. Also, the program must be fast and can did everything.
9. First: Write one welcome sentence. And write what do you want doing. And when he is finished, I will say Good buy.
(misunderstanding)
10. The program is very neat. Aligned. Use the Comment. Thoughtful.
(missing: separation of concerns)
"""
|
"""
to set your window at the center point
"""
import tkinter as tk
# from tkinter import *
root = tk.Tk()
root.title('Python GUI - Position')
# set position
root.geometry('800x450-300+200')
root.iconbitmap('img/IMG_2408.ico')
# set your window at center point
root.mainloop()
|
# flow control - if statement
# 0 - 9.99 buy a knife
# 10 - 19.99 buy a armor
# 20 - 29.99 buy a pair shoes
# 30 - 39.99 buy a pendent
# 40 - 49.99 buy an earing
# 50 - 50.99 buy a ring
# 60 - 69.99 buy a sword
# 70 arena
while(True):
level = int(input("Enter your current level: "))
if level < 0:
print("Your level is invalid.")
break;
if level <10:
print("buy a knife")
elif level < 20:
print("buy an armor")
elif level < 30:
print("buy a pair shoes")
elif level < 40:
print("buy a pendent")
elif level < 50:
print("buy an earing")
elif level < 60:
print("buy a ring")
elif level < 70:
print("buy a sword")
else:
print("can go to arena")
print("bye-bye")
|
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