# Write a Pandas program to import three datasheets from a given excel data (employee.xlsx ) into a single dataframe and export the result into new Excel file.  
import pandas as pd
import numpy as np
df1 = pd.read_excel('E:\employee.xlsx',sheet_name=0)
df2 = pd.read_excel('E:\employee.xlsx',sheet_name=1)
df3 = pd.read_excel('E:\employee.xlsx',sheet_name=2)
df = pd.concat([df1, df2, df3])
df.to_excel('e:\output.xlsx', index=False)
