pandas-dev

pandas-dev/pandas

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

47.1K stars 19.3K forks 47.1K watchers Python BSD 3-Clause "New" or "Revised" License

alignment data-analysis data-science flexible pandas python

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94 Open Issues Need Help Last updated: Nov 11, 2025

Open Issues Need Help

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DOC: Replace `@Appender`, `@Substitution`, `@doc` with inlined docstrings about 1 hour ago

AI Summary: This GitHub issue proposes refactoring the pandas codebase to replace its current dynamic docstring system, which uses decorators like `@Appender`, `@Substitution`, and `@doc` along with `shared_docs` templates. The goal is to replace these with hardcoded, inlined docstrings directly after function signatures. This change aims to improve clarity for new contributors and enable static analysis tools like Ruff to validate docstrings directly, moving away from a subprocess-based validation system.

Complexity: 4/5

Docs good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

STY: Enforce Ruff rule B905, zip-without-explicit-strict about 9 hours ago

Code Style good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Copy not working as expected within DataFrameGroupBy.apply function about 19 hours ago

Bug Groupby Apply good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

TST: Replace `ensure_clean` utility function with the `temp_file` pytest fixture about 21 hours ago

Testing good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: index.union fails at DST boundary about 22 hours ago

Bug Timezones good first issue Needs Tests Index

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

Possible bug in df.update 1 day ago

Bug Datetime good first issue ExtensionArray Needs Tests combine/combine_first/update

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Subtraction fails with matching index of different name and type 1 day ago

Bug Numeric Operations good first issue ExtensionArray Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: DataFrame.set_axis() and rename_axis() fail if allows_duplicate_labels=False 3 days ago

Bug Indexing good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Assigning extension array value to series of dtype object fails if element type is array-like 4 days ago

Bug Indexing Regression good first issue ExtensionArray Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

Information for new contributors 4 days ago

good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: Explain how to load data in Google Colab 4 days ago

Docs good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Conversion from datetime64[ns] to datetime does not effect .info() and probably not the DataFrame itself 4 days ago

Bug Datetime good first issue Needs Tests Describe/info/etc

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: dtype changes when assigning on a slice or list of labels with .loc or iloc 4 days ago

Bug Indexing Dtype Conversions good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Difference between calamine and openpyxl readers - columns with mixed data types 4 days ago

Bug IO Excel good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Series[python_str].__setitem__(series[pyarrow_string] 5 days ago

Bug Strings good first issue Needs Tests Arrow

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Enlarging multilevel index fails if one or more level keys are None 5 days ago

Bug Missing-data MultiIndex good first issue Needs Tests setitem-with-expansion

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: infer_freq has stateful behavior 6 days ago

Bug Frequency good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

.add gives incorrect result with MI Dataframe with mix of object and datetimes on index. 6 days ago

Bug Datetime Dtype Conversions Numeric Operations MultiIndex good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: DataFrame.agg - why numpy.size doesn't work? 7 days ago

Bug Apply good first issue Needs Tests ufuncs

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Timedelta resolution is different depending on how the argument is passed 7 days ago

Bug Timedelta good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: df.sum() of string columns depends on whether or not they can be coerced to numbers 7 days ago

Bug Strings good first issue Needs Tests Reduction Operations

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: DataFrame.update do not preserve string dtype 7 days ago

Bug Dtype Conversions Strings good first issue Needs Tests pyarrow dtype retention combine/combine_first/update

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: read_sql no longer works simply with SqlAlchemy selectables and a quick fix 7 days ago

IO SQL good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

Series.replace not working on slices of heterogenoues types 7 days ago

Bug Missing-data good first issue Needs Tests replace

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: Expand data table respresentation 10 days ago

Docs good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: `tolerance` in `Index.reindex` can be a `Sequence` at runtime 11 days ago

Docs good first issue Index

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

combine_first not unionising the columns of empty dataframes 11 days ago

Bug good first issue Needs Tests combine/combine_first/update

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

Series.combine with fill_value gives unexpected results 11 days ago

Bug good first issue Needs Tests combine/combine_first/update

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DataFrame.update silently does nothing when indices are of differing type 12 days ago

Bug good first issue Needs Tests combine/combine_first/update

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

Multi Index timeindex Selecting with xs differs from loc 12 days ago

Bug Datetime Indexing MultiIndex good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: Ensure guides are linked from relevant API docs 12 days ago

Docs good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

ENH: Better error message when interpolating dtype integer with method="linear" 13 days ago

Enhancement Missing-data Error Reporting good first issue Needs Tests NA - MaskedArrays

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Setting datetime value using dataframe masking appears to transpose the mask 13 days ago

Bug Datetime Indexing Missing-data good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Inconsistency in DataFrame.where between inplace and not inplace with na like value for StringArray 13 days ago

Bug Strings good first issue ExtensionArray Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: inconsisntent construction results between `pd.array` and `pd.Series` for dtype=str 13 days ago

Bug good first issue Needs Tests Constructors

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: empty slice assignment raises if datetime column is present 13 days ago

Bug Indexing good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

Possible bug when parsing from string to datetime when slicing 14 days ago

Bug Datetime Indexing good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Strange behavior when accessing datetime.date index with np.datetime64 15 days ago

Bug Indexing good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: df.where(ea) coerces to object, rather than nullable dtype like ser.where(ea) does 15 days ago

Bug Missing-data good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: concat with datetime64 columns of differing resolutions results in object dtype 15 days ago

Bug Datetime Reshaping good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Resampler.interpolate downcast keyword deprecated? 16 days ago

Bug Dtype Conversions Deprecate good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

COMPAT: can we reduce pathological cases in Index comparisons 17 days ago

Bug Datetime good first issue Needs Tests Index Constructors API - Consistency

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

[Feature Request] Add `replace` method to `Index` objects 19 days ago

Enhancement good first issue replace

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: Example missing in pandas.DataFrame.to_html 21 days ago

Docs IO HTML good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

WEB: Multiple "Getting Started" on pandas.io leads to different links 22 days ago

good first issue Web

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: Simplify pandas theme footer 22 days ago

Docs good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: CustomBusinessDay not respecting calendar 25 days ago

Bug Frequency good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Week ('W') does not work as suffixes for a string passed to Timedelta. 26 days ago

Bug Timedelta good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

ENH: set `__module__` on top-level public objects 26 days ago

Enhancement Output-Formatting good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: `fillna` cannot convert NaN to None 27 days ago

Bug Missing-data good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: enlarging a DataFrame by adding an extra column with a tz-aware datetime results in object dtype 27 days ago

Bug Datetime Dtype Conversions good first issue Needs Tests setitem-with-expansion

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: DateOffset addition gives UserWarning: Discarding nonzero nanoseconds in conversion 27 days ago

Bug Numeric Operations Frequency good first issue Needs Tests Warnings Closing Candidate

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: itemsize wrong for date32[day][pyarrow] dtype? 28 days ago

Bug good first issue Arrow

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: DataFrame.rank does not return EA types when original type was an EADtype 29 days ago

Bug Dtype Conversions good first issue ExtensionArray Reduction Operations pyarrow dtype retention

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

Combining two Series of dtype `Int8` converts them to `Int64` 29 days ago

Bug Dtype Conversions Numeric Operations good first issue Needs Tests combine/combine_first/update

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: groupby.var() does not return arrow types with arrow backed series as input. 29 days ago

Bug Groupby good first issue Needs Tests Arrow pyarrow dtype retention

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: assert_frame_equal(check_dtype=False) fails when comparing two DFs containing pd.NA that only differ in dtype (object vs Int32) 29 days ago

Bug Testing good first issue ExtensionArray

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

append a categorical with different categories to the existing about 1 month ago

Docs Categorical good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: need to block split when filling na about 1 month ago

good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

Updating value of a single row of a column using loc or at fails about 1 month ago

good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: Single Document For Code Guidelines about 1 month ago

Docs Code Style good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

CLN: Use dedup_names in all instances where duplicate column names are renamed about 1 month ago

IO HTML Clean good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

ERR: ``numeric_only`` in reduction operations should disallow passing non-bools about 1 month ago

Error Reporting good first issue Reduction Operations

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Merge fails on pyarrow datetime columns about 1 month ago

Bug Datetime Reshaping good first issue Arrow

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Regression in Series.pow with all-NA `double[pyarrow]` values in pandas 3.x about 1 month ago

Bug Regression Numeric Operations good first issue Arrow

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: pivot function about 1 month ago

AI Summary: The user reports that the documentation for `DataFrame.pivot` is unclear regarding the "object" type hint for the `index`, `columns`, and `values` parameters. They are unsure if "object" refers to a MultiIndex, None, or Series, and provide a Stack Overflow link to illustrate the confusion. This issue requests clarification in the documentation to specify the actual accepted types.

Complexity: 2/5

Docs Reshaping good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: min_itemsize for HDFStore append for encoded strings about 1 month ago

Docs IO HDF5 good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: Incorrect Source Link about 1 month ago

Docs good first issue Needs Triage

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: concat_{categorical, compat} leads to erroneous result on non-ns datetime-EA about 1 month ago

Bug Reshaping good first issue ExtensionArray Needs Tests Non-Nano

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

API/BUG: freq retention in value_counts about 2 months ago

Bug Frequency Algos good first issue Needs Tests freq retention

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: floating point precision on writing/reading to csv about 2 months ago

Docs IO CSV good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

ENH: Change ExtensionOpsMixin behaviour to not add new operator method if one is already defined on the ExtensionArray class about 2 months ago

Enhancement Numeric Operations good first issue ExtensionArray

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: `Series.clip` does not work with scalar numpy arrays. about 2 months ago

Bug Needs Discussion good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

Indexing on series where index is output from pd.cut about 2 months ago

Indexing good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

startingMonth ignored on non-unitary Quarter periods about 2 months ago

Frequency Resample good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: Enforce Numpy Docstring Validation (Parent Issue) about 2 months ago

Docs good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Interpolate over time does not work with Int64 or Float64 about 2 months ago

Bug Missing-data good first issue Needs Tests NA - MaskedArrays

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: groupby.sum() is inconsistent with df.sum() for large integers about 2 months ago

Bug Groupby Dtype Conversions good first issue Needs Tests Reduction Operations

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

`pd.groupby` seems to mutate my `pd.Grouper` in-place about 2 months ago

Groupby good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: Clarify parentheses vs. brackets about 2 months ago

Docs good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

Series.map on a Categorical with a function only processes each unique value once about 2 months ago

Docs Categorical Apply good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: `DataFrame.mean(axis=1)` fails but `Series.mean` works incase of pandas Nullable integer dtype 2 months ago

Bug good first issue Needs Tests NA - MaskedArrays Reduction Operations

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: NaT - "alias of NaT"; NA - "alias of <NA>" 2 months ago

Docs Missing-data good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: AssertionError: Did not expect new dtype float64 to equal self.dtype float64. Please report a bug 2 months ago

Bug Missing-data Categorical good first issue Needs Tests PDEP6-related

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: loc fails with tz_aware DateTimeIndex 2 months ago

Bug Indexing Timezones good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: Insert then delete column into MultiIndex with timestamps leads to RecursionError 2 months ago

Bug Indexing MultiIndex good first issue Needs Tests

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

inplace kwarg must be of bool type, but other boolean kwargs don't have this restriction 2 months ago

Enhancement Error Reporting good first issue API - Consistency inplace

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

BUG: In main, TimedeltaIndex.shift() requires freq in the index, but it may not be available because it was computed 2 months ago

Bug Timedelta Blocker good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

Various methods don't call call __finalize__ 2 months ago

Bug good first issue metadata

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

ENH: Rename internal `DataFrame._append()` 3 months ago

Enhancement API Design good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

issue when shifting with Timedelta in a groupby 3 months ago

Docs Groupby Timedelta good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: `.str.cat` output in case of `Index` object 3 months ago

Docs good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

ENH: Add Polars engine to read_csv 4 months ago

AI Summary: The task is to add a Polars engine to the pandas `read_csv` function. This would allow users to leverage Polars' speed for CSV reading, improving pandas' performance. The task requires understanding both pandas and Polars APIs, and integrating them effectively. It also involves testing the new functionality thoroughly.

Complexity: 4/5

IO CSV good first issue

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python

DOC: Index.infer_objects is missing from docs 5 months ago

AI Summary: Update the pandas documentation to include a reference to the `Index.infer_objects` method. This involves adding the method to the relevant section of the documentation file (`pandas/doc/source/reference/indexing.rst`), likely within the conversion section.

Complexity: 2/5

Docs good first issue Index

pandas-dev/pandas

47.1K

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Python

#alignment#data-analysis#data-science#flexible#pandas#python