Pandas QST:

Research[X] I have searched the [pandas] tag on StackOverflow for similar questions.[X] I have asked my usage related qu...

Pandas BUG: to_datetime dayfirst, infer_datetime_format and coerce produces unexpected error

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

Pandas BUG: .fillna(-1) does not work in pd.eval

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

Pandas _normalize_keyword_aggregation named agg helper function should be made public

Slightly related to #28380 Currently an issue in Dask https://github.com/dask/dask/issues/5294 for implementing Named Ag...

Pandas Type check on dataframe aggregation functions

OS: Windows 10Python: 3.7.3Pandas: 0.25.1The DataFrame object has functions such as mean() and sum() which return a Seri...

Pandas CI: min versions timeouts

I didn't see an open issue, but the min versions job has been timing out for the past few days. Looking at the logs from...

Pandas Move helper methods for Named Aggregation out of groupby/generic

Related to #28333 and #26513 There are several helper methods to help with named aggregations, that are found in pandas....

Pandas REF: de-duplicate Index._find_common_type_compat and dtypes.cast.find_result_type

In particular both include logic for working around Categoricals. Not sure how much is shareable, but worth a shot.Comm...

Pandas DEV: reduce merge conflicts by sorting whatsnew notes by issue number?

@jbrockmendel noted here that whatsnew notes are a major source of merge conflicts. @rhshadrach also mentioned it in Sla...

Pandas BUG: pandas.Index.union does not behave properly across summer hour change

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

Pandas DEPR/Community: spin off s3 support

A disproportionate amount of our CI failures are in s3 tests e.g. test_with_s3_url. Moreover we have 2 xfailed tests wi...

Pandas BUG: DataFrame with index having tzlocal() timezone could not be saved to parquet

[x] I have checked that this issue has not already been reported.[x] I have confirmed this bug exists on the latest vers...

Pandas BUG: UTC offset incorrect on dst transition with dateutil tz when using date_range

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

Pandas ENH: add regex=False option to pandas.Series.str.match and fullmatch (like in str.contains)

Feature Type[ ] Adding new functionality to pandas[X] Changing existing functionality in pandas[ ] Removing existing fun...

Pandas BUG: reading CSV from online taking a long time

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

Pandas DOC fix EX02 errors in docstrings

pandas has a script for validating docstringshttps://github.com/pandas-dev/pandas/blob/ced983358b06576af1a73c3e936171cc6...

Pandas PERF: Implement date_range for business day in terms of daily

Code Sample, a copy-pastable example if possible@dsm054 noticed that business day performance is slow relative to dailyT...

Pandas CLN: define .mode in terms of value_counts

we have quite a lot of code to support .mode (internally we use pretty much the same algos as .value_counts())but unless...

Pandas PERF: concat of pyarrow string array does not rechunk

In [2]: import pandas as pdIn [3]: pd.__version__Out[3]: '1.4.0.dev0+143.g5675cd8ab2'In [4]: s = pd.concat([pd.Series(li...

Pandas BUG: "__index_level_0__" column in 0-row parquet file

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