Pandas DataFrame vs Series vs Index arithmetic Roundup

Categorical:- [x] #19513 Comparisons between Categorical, CategoricalIndex, and Series[category] are inconsistent- [x] #...

Pandas Series[Period] +/- NaT returns Series[datetime64]

per = pd.Period('2016Q1')ser = pd.Series([per])>>> ser - pd.NaT0 NaTdtype: datetime64[ns]>>> ser + p...

Pandas DOC: Rethink recommending eval/query in "Enhancing performance" section of user guide

Location of the documentationhttps://pandas.pydata.org/pandas-docs/stable/user_guide/enhancingperf.html#expression-evalu...

Pandas API: Difference between GroupBy, DataframeGroupBy, and SeriesGroupBy

Hi allI couldn't find a good answer to this on StackOverflow, but I was trying to understand what the conceptual differe...

Pandas BUG: df.groupby().nth() returns wrong order of values

Pandas version checks[X] I have checked that this issue has not already been reported.[X] I have confirmed this bug exis...

Pandas REF/API: make pd.Grouper immutable

Grouper._set_grouper (called by Grouper._get_grouper) sets some of its own attributes. It would be much easier to reaso...

Pandas QST: | (or) behavior when working with two series that have different indexes

[x] I have searched the [pandas] tag on StackOverflow for similar questions.[x] I have asked my usage related question o...

Pandas DataFrame.query raises ValueError when comparing columns with nullable dtypes

Code SampleIn [2]: df1 = pd.DataFrame({'A': [1, 1, 2], 'B': [1, 2, 2]})In [3]: df1.dtypesOut[3]:A int64B int64dtyp...

Pandas BUG: Query on Int64Dtype raises ValueError

Pandas version checks[X] I have checked that this issue has not already been reported.[X] I have confirmed this bug exis...

Pandas Int64 can't be used in pandas.eval()

This code works fineimport pandas as pdd = pd.DataFrame([[1, 2], [3, 4]], columns=['a', 'b'], dtype="Float64")...

Pandas AmbigousTimeError on Timestamp.floor during dst change

Code Sample, a copy-pastable example if possibleimport pandas as pdpd.Timestamp('2018-11-04 01:55:17.869342-0500', tz='A...

Pandas BUG: Groupby() with a categorical variable creates the incorrect number of groups when the original DF is reduced.

Pandas version checks[X] I have checked that this issue has not already been reported.[X] I have confirmed this bug exis...

Pandas BUG: df.groupby().nth(n=3, dropna="all") throwing error

Pandas version checks[X] I have checked that this issue has not already been reported.[X] I have confirmed this bug exis...

Pandas API: Timestamp and Timedelta .value changing in 2.0

import pandas as pdimport numpy as npdt = np.datetime64("2016-01-01", "ms")ts = pd.Timestamp(dt)>...

Pandas BUG: DataFrame.dtypes doesn't include backend for string columns

Pandas version checks[X] I have checked that this issue has not already been reported.[X] I have confirmed this bug exis...

Pandas BUG: Different behavior for different index types

Pandas version checks[X] I have checked that this issue has not already been reported.[X] I have confirmed this bug exis...

Pandas BUG: Calling sample() on an empty GroupbyDataFrame returns ValueError instead of an empty DF

Pandas version checks[X] I have checked that this issue has not already been reported.[X] I have confirmed this bug exis...

Pandas DEPR: log of deprecations in 1.x (to be removed in 2.0)

Similar issue as https://github.com/pandas-dev/pandas/issues/6581, but starting a fresh one for keeping a log of the dep...

Pandas BUG: DTA/TDA setitem breaks freq on views

DatetimeArray/TimedeltaArray __setitem__ resets the array's freq to None, but this doesn't propagate to views:dti = pd.d...

Pandas CLN: Refactor Index._validate_names()

Currently Index._validate_names() does not only validation, but some other unrelated to validation stuff:https://github....
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