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- [V] tests added / passed
- [V] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
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https://api.github.com/repos/pandas-dev/pandas/issues/39421 | https://api.github.com/repos/pandas-dev/pandas | https://api.github.com/repos/pandas-dev/pandas/issues/39421/labels{/name} | https://api.github.com/repos/pandas-dev/pandas/issues/39421/comments | https://api.github.com/repos/pandas-dev/pandas/issues/39421/events | https://github.com/pandas-dev/pandas/pull/39421 | 794,559,400 | MDExOlB1bGxSZXF1ZXN0NTYyMDU1MjY2 | 39,421 | BUG: Subset slicer on Styler failed on MultiIndex with slice(None) | {
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- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
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- [x] I have confirmed this bug exists on the latest version of pandas.
- [ ] (optional) I have confirmed this bug exists on the master branch of pandas.
---
**Note**: Please read [this guide](https://matthewrocklin.com/blog/work/2018/02/28... | {
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#### Code Sample, a copy-pastable example
```python
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https://api.github.com/repos/pandas-dev/pandas/issues/39429 | https://api.github.com/repos/pandas-dev/pandas | https://api.github.com/repos/pandas-dev/pandas/issues/39429/labels{/name} | https://api.github.com/repos/pandas-dev/pandas/issues/39429/comments | https://api.github.com/repos/pandas-dev/pandas/issues/39429/events | https://github.com/pandas-dev/pandas/pull/39429 | 794,639,952 | MDExOlB1bGxSZXF1ZXN0NTYyMTIzMTky | 39,429 | Backport PR #39406 on branch 1.2.x (DOC: link to correct PR) | {
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- [ X] I have confirmed this bug exists on the latest version of pandas.
- [ ] (optional) I have confirmed this bug exists on the master branch of pandas.
---
**Note**: Please read [this guide](https://matthewrocklin.com/blog/work/2018/02/... | {
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https://api.github.com/repos/pandas-dev/pandas/issues/39431 | https://api.github.com/repos/pandas-dev/pandas | https://api.github.com/repos/pandas-dev/pandas/issues/39431/labels{/name} | https://api.github.com/repos/pandas-dev/pandas/issues/39431/comments | https://api.github.com/repos/pandas-dev/pandas/issues/39431/events | https://github.com/pandas-dev/pandas/issues/39431 | 794,837,791 | MDU6SXNzdWU3OTQ4Mzc3OTE= | 39,431 | QST: How to solve the problem KeyError: "['Label'] not found in axis" ?? | {
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] | closed | false | null | [] | null | 5 | 2021-01-27T07:11:56Z | 2021-02-07T15:15:44Z | 2021-02-07T15:15:44Z | NONE | null | I am working on network traffic classification using tf.keras. i want to drop a column name Label and set Label as Y and all other columns in X. I am using pandas. here is the code line:
**df =df.drop(['Label'], axis=1, inplace=True)**
I am getting the following error:
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xref #26599
- [X] closes #26599
- [X] tests added / passed
- [X] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [X] whatsnew entry
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- [ x] I have confirmed this bug exists on the latest version of pandas.
- [ ] (optional) I have confirmed this bug exists on the master branch of pandas.
---
#### Code Sample, a copy-pastable example
```python
import pandas as pd
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- [x] I have confirmed this bug exists on the latest version of pandas.
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---
**Note**: Please read [this guide](https://matthewrocklin.com/blog/work/2018/02/28... | {
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In general, the implementation of this idea should contribute to simplification of reading functions use and reduce the use of boilerplate code.
On the other hand, this shouldn't make it much more difficult to maintain that functions in Pandas.
Current reading a... | {
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https://api.github.com/repos/pandas-dev/pandas/issues/39436 | https://api.github.com/repos/pandas-dev/pandas | https://api.github.com/repos/pandas-dev/pandas/issues/39436/labels{/name} | https://api.github.com/repos/pandas-dev/pandas/issues/39436/comments | https://api.github.com/repos/pandas-dev/pandas/issues/39436/events | https://github.com/pandas-dev/pandas/issues/39436 | 795,246,027 | MDU6SXNzdWU3OTUyNDYwMjc= | 39,436 | ValueError: Must produce aggregated value, if DataFrame contains a DataFrame as an element | {
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... | open | false | null | [] | null | 1 | 2021-01-27T16:21:10Z | 2021-07-05T16:29:31Z | null | NONE | null | This minimal example assigns the column B the first value of each group:
```
df = pd.DataFrame(data=np.asarray([[1,1,1,2],[4,4,4,10]]).transpose(),columns = ['A','B'])
print(df)
dfagg = df.groupby('A').agg({'B' : lambda x : x.iloc[0]})
print(dfagg)
```
Hence
```
A B
0 1 4
1 1 4
2 1 4
3 2 ... | {
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https://api.github.com/repos/pandas-dev/pandas/issues/39438 | https://api.github.com/repos/pandas-dev/pandas | https://api.github.com/repos/pandas-dev/pandas/issues/39438/labels{/name} | https://api.github.com/repos/pandas-dev/pandas/issues/39438/comments | https://api.github.com/repos/pandas-dev/pandas/issues/39438/events | https://github.com/pandas-dev/pandas/issues/39438 | 795,254,643 | MDU6SXNzdWU3OTUyNTQ2NDM= | 39,438 | BUG: inconsistent `at` setter method | {
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#### Problem description
I am seeing some very strange behaviour. I have a python function which does simple manipulation of data in a DataFrame.
this code is very simple - unit tests work in the relevant package - however the behaviour is very different in server environment - where function is called via rest... | {
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- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [x] whatsnew entry
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- [x] closes #39247
- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
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] | closed | false | null | [] | null | 15 | 2021-01-27T18:58:50Z | 2021-03-06T20:53:11Z | 2021-03-06T20:53:11Z | CONTRIBUTOR | null | Splited original contributing.rst into 3 separate pages:
- Removed information for setting up an environment outside of Docker and created a new file for this purpose.
- Removed information for contributing to the codebase and created a new file for this purpose.
- Reformatted contributing.rst and renamed as contrib... | {
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- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
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... | 9 | 2021-01-27T21:37:24Z | 2021-08-31T11:12:03Z | null | CONTRIBUTOR | null | - [X] I have checked that this issue has not already been reported.
- [X] I have confirmed this bug exists on the latest version of pandas.
- [X] (optional) I have confirmed this bug exists on the master branch of pandas.
---
#### Code Sample, a copy-pastable example
```python
import pandas as pd
from ... | {
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- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry
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I have the following data and I want to apply the interpolate method using a spline to the last 4 numbers (I'm aware this is extrapolation):
```python
import numpy as np
x = [
18.792571,
19.170139,
19.370556,
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- [x] I have asked my usage related question on [StackOverflow](https://stackoverflow.com).
---
Under certain cases, doing an assignment on a DataFrame created using `.dropna()` e... | {
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- [x] I have confirmed this bug exists on the latest version of pandas.
Bug exists in 1.2.1, not in <=1.2.0
- [ ] (optional) I have confirmed this bug exists on the master branch of pandas.
---
**Note**: Please read [this guide](https://ma... | {
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- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry
Added validation of ``ascending`` for ``sort_index`` methods.
Proposed a solution to rais... | {
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https://api.github.com/repos/pandas-dev/pandas/issues/39464 | https://api.github.com/repos/pandas-dev/pandas | https://api.github.com/repos/pandas-dev/pandas/issues/39464/labels{/name} | https://api.github.com/repos/pandas-dev/pandas/issues/39464/comments | https://api.github.com/repos/pandas-dev/pandas/issues/39464/events | https://github.com/pandas-dev/pandas/pull/39464 | 796,552,573 | MDExOlB1bGxSZXF1ZXN0NTYzNzEzMDE4 | 39,464 | BUG: Fix sort_values bug that creates unprintable object | {
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- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
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The problem occurs when sorting on columns and the `ignore_index` parameter is set to `Tr... | {
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- [x] I have confirmed this bug exists on the latest version of pandas.
- [x] (optional) I have confirmed this bug exists on the master branch of pandas.
---
```python
a=pd.DataFrame({'a':[1,2,3,4,5],'b':[4,5,6,7,8]})
a.to_csv('myfile.c... | {
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https://api.github.com/repos/pandas-dev/pandas/issues/39466 | https://api.github.com/repos/pandas-dev/pandas | https://api.github.com/repos/pandas-dev/pandas/issues/39466/labels{/name} | https://api.github.com/repos/pandas-dev/pandas/issues/39466/comments | https://api.github.com/repos/pandas-dev/pandas/issues/39466/events | https://github.com/pandas-dev/pandas/pull/39466 | 796,690,407 | MDExOlB1bGxSZXF1ZXN0NTYzODI4NjE5 | 39,466 | TYP, CLN annotate some variables, remove some possibly unused ones | {
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The [mypy daemon](https://mypy.readthedocs.io/en/latest/mypy_daemon.html) throws some extra `var-annotated` errors compared with `mypy pandas`, so I've tried fix... | {
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... | 5 | 2021-01-29T12:33:46Z | 2021-02-25T01:58:40Z | null | NONE | null | #### Is your feature request related to a problem?
As a part of a research project, me and two co-authors have been mining GitHub for Jupyter notebooks and studied a number of frequent function calls in the notebooks. It appears that users sometimes make calls to `read_csv`, specifying `dtype` as a dict containing key... | {
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https://github.com/pandas-dev/pandas/blob/master/doc/source/development/test_writing.rst
#### Documentation problem
The `test_writitng.rst` file doesn't have the standard header.
#### Suggested fix for documentation
This can be fixed by adding `{{ header }}` at the begi... | {
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- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry
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1. refactor `pivot_table` function to avoid overhead of `_finalize__` calls when a list of aggfuncs passed
2. call `__finalize__` before returning `groupby.mean` and `groupby.median`
3. add tests for 1 and 2
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- [X] I have confirmed this bug exists on the latest version of pandas.
- [ ] (optional) I have confirmed this bug exists on the master branch of pandas.
---
#### Code Sample, a copy-pastable example
```python
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- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
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- [x] I have confirmed this bug exists on the latest version of pandas.
- [ ] (optional) I have confirmed this bug exists on the master branch of pandas.
---
#### Code Sample, a copy-pastable example
```python
# import pandas as pd
# impor... | {
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- [x] I have confirmed this bug exists on the latest version of pandas.
- [ ] (optional) I have confirmed this bug exists on the master branch of pandas.
-... | {
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import numpy as np
import pandas as pd
df = pd.DataFrame(
np.zeros([1, 5]),
columns=pd.MultiIndex.from_tuples(
[
(0, None, None),
(0, 0, 0),
(0, 0, 1),
(0, 1, 0),
(0, 1, 1),
],
)
)
```
![image](https://user-i... | {
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---
#### Question About GroupBy Aggregation Behavior
I observed a behavior of the Pandas GroupBy method `agg()` which I cannot explain based on the [docs](https://panda... | {
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This should probably go in 1.2.2.
<1.2.0: `engine=c` and `engine=python` handled encoding errors differently when `encoding=None` (python: "replace", c: "strict"). The `engine=c` further supported to ignore lines (`skiprows`) with encoding errors iff `encoding=None`.
1.2.0 (shared file opening code... | {
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- [x] I have confirmed this bug exists on the latest version of pandas.
- [ ] (optional) I have confirmed this bug exists on the master branch of pandas.
---
#### Code Sample, a copy-pastable example
```python
import pandas as pd
impor... | {
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Some notes:
1. Had to use `Any` in a number of places, because an `ExtensionArray` can contain any type
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- [x] I have confirmed this bug exists on the latest version of pandas.
- [x] (optional) I have confirmed this bug exists on the master branch of pandas.
---
**Note**: Please read [this guide](https://matthewrocklin.com/blog/work/2018/02/28... | {
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- [x] closes #38862
- [ ] tests added / passed
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Since pre-commit in comment-bot runs on all files, it's a bit slow. Running it only... | {
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```python
c = pd.DataFrame({ 'a':[1,2] ,'b':[3,4]})
d = c.iloc[0] # makes a series
e = d.drop(columns=['a'])
'''
a 1
b 3
Name: 0, dtype: int64
'''
```
#### Problem description
Drop silently fails on series. It does nothing when the user tries an impossible operation (dropping column from a ... | {
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https://api.github.com/repos/pandas-dev/pandas/issues/39512 | https://api.github.com/repos/pandas-dev/pandas | https://api.github.com/repos/pandas-dev/pandas/issues/39512/labels{/name} | https://api.github.com/repos/pandas-dev/pandas/issues/39512/comments | https://api.github.com/repos/pandas-dev/pandas/issues/39512/events | https://github.com/pandas-dev/pandas/pull/39512 | 797,818,288 | MDExOlB1bGxSZXF1ZXN0NTY0NzMzODkz | 39,512 | CLN: Fix userguide deprecation warning new numpy | {
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https://api.github.com/repos/pandas-dev/pandas/issues/39513 | https://api.github.com/repos/pandas-dev/pandas | https://api.github.com/repos/pandas-dev/pandas/issues/39513/labels{/name} | https://api.github.com/repos/pandas-dev/pandas/issues/39513/comments | https://api.github.com/repos/pandas-dev/pandas/issues/39513/events | https://github.com/pandas-dev/pandas/issues/39513 | 797,823,324 | MDU6SXNzdWU3OTc4MjMzMjQ= | 39,513 | TYP: Mypy failures with new numpy | {
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cc @simonjayhawkins | {
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https://api.github.com/repos/pandas-dev/pandas/issues/39514 | https://api.github.com/repos/pandas-dev/pandas | https://api.github.com/repos/pandas-dev/pandas/issues/39514/labels{/name} | https://api.github.com/repos/pandas-dev/pandas/issues/39514/comments | https://api.github.com/repos/pandas-dev/pandas/issues/39514/events | https://github.com/pandas-dev/pandas/issues/39514 | 797,823,399 | MDU6SXNzdWU3OTc4MjMzOTk= | 39,514 | BUG: Reading csv files with numbers with multiple leading zeros losses a lot of precision | {
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... | 5 | 2021-01-31T22:04:03Z | 2021-02-11T15:18:46Z | null | NONE | null | - [x] I have checked that this issue has not already been reported.
- [x] I have confirmed this bug exists on the latest version of pandas.
- [x] (optional) I have confirmed this bug exists on the master branch of pandas.
#### Code Sample, a copy-pastable example
```
caleb ~ $ cat sample_read_wrong.tsv
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https://api.github.com/repos/pandas-dev/pandas/issues/39515 | https://api.github.com/repos/pandas-dev/pandas | https://api.github.com/repos/pandas-dev/pandas/issues/39515/labels{/name} | https://api.github.com/repos/pandas-dev/pandas/issues/39515/comments | https://api.github.com/repos/pandas-dev/pandas/issues/39515/events | https://github.com/pandas-dev/pandas/pull/39515 | 797,834,037 | MDExOlB1bGxSZXF1ZXN0NTY0NzQ1ODQx | 39,515 | REGR: Reading csv files with numbers with multiple leading zeros losses a lot of precision | {
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] | closed | false | null | [] | null | 3 | 2021-01-31T22:57:17Z | 2021-02-11T15:18:35Z | 2021-02-11T14:36:08Z | NONE | null | - [x] closes #39514
- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry
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https://api.github.com/repos/pandas-dev/pandas/issues/39516 | https://api.github.com/repos/pandas-dev/pandas | https://api.github.com/repos/pandas-dev/pandas/issues/39516/labels{/name} | https://api.github.com/repos/pandas-dev/pandas/issues/39516/comments | https://api.github.com/repos/pandas-dev/pandas/issues/39516/events | https://github.com/pandas-dev/pandas/pull/39516 | 797,867,445 | MDExOlB1bGxSZXF1ZXN0NTY0NzcyNzkw | 39,516 | ENH: Add I/O support of XML with pandas.read_xml and DataFrame.to_xml… | {
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- [X] closes #27554
- [X] tests added / passed
- [X] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [X] whatsnew entry
- [X] io entry
- [X] install entry
To Do List
- [ ] Add `parse_dates` f... | {
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- [ ] tests added / passed
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https://api.github.com/repos/pandas-dev/pandas/issues/39518 | https://api.github.com/repos/pandas-dev/pandas | https://api.github.com/repos/pandas-dev/pandas/issues/39518/labels{/name} | https://api.github.com/repos/pandas-dev/pandas/issues/39518/comments | https://api.github.com/repos/pandas-dev/pandas/issues/39518/events | https://github.com/pandas-dev/pandas/issues/39518 | 798,005,725 | MDU6SXNzdWU3OTgwMDU3MjU= | 39,518 | ENH: Using nrows option while processing xlsb files | {
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I wish pandas can use nrows eagerly while processing xlsx or xlsb files
https://github.com/pandas-dev/pandas/blob/master/pandas/io/excel/_pyxlsb.py#L73
If we see this code, this tries to process all the sheetdata and later apply nrows, which is very very slow in... | {
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