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ENH: Remove the DataFrame.attrs saving to parquet metadata on Pandas' side

Enhancement

IO Parquetparquet, featherparquet, feather

metadata_metadata, .attrs_metadata, .attrs

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Status: Open.

#62098 In pandas-dev/pandas;

· rmnskb opened on Aug 12, 2025

BUG:Pandas: Custom Metadata in DataFrame Subclass Not Deep-Copied

Bug

metadata_metadata, .attrs_metadata, .attrs

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

SubclassingSubclassing pandas objectsSubclassing pandas objects

Status: Open.

#62071 In pandas-dev/pandas;

· Qi-henry opened on Aug 8, 2025

BUG: If you add _metadata to a custom subclass of Series, the sequence name is lost when indexing

Bug

metadata_metadata, .attrs_metadata, .attrs

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

SubclassingSubclassing pandas objectsSubclassing pandas objects

Status: Open.

#61491 In pandas-dev/pandas;

· vitalizzare opened on May 24, 2025

ENH: Support attrs in feather files

Enhancement

IO Parquetparquet, featherparquet, feather

metadata_metadata, .attrs_metadata, .attrs

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Status: Open.

#60675 In pandas-dev/pandas;

· phemmer opened on Jan 8, 2025

BUG: Regression in v2.2.x Pandas DataFrame Raises a __deepcopy__ error when class placed in <code>attrs</code>

Bug

metadata_metadata, .attrs_metadata, .attrs

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Status: Open.

#57859 In pandas-dev/pandas;

· achapkowski opened on Mar 15, 2024

BUG: Series attrs disappear after modifcation to the DataFrame that contains them.

Bug

metadata_metadata, .attrs_metadata, .attrs

Status: Open.

#57267 In pandas-dev/pandas;

· lendres opened on Feb 5, 2024

ENH: Preserve column attrs when doing column selection

Enhancement

metadata_metadata, .attrs_metadata, .attrs

Status: Open.

#55552 In pandas-dev/pandas;

· kerrickstaley opened on Oct 16, 2023

ENH: add Groupby.attrs namespace to access groupby attributes

Enhancement

Groupby

metadata_metadata, .attrs_metadata, .attrs

Status: Open.

#53642 In pandas-dev/pandas;

· topper-123 opened on Jun 13, 2023

ENH: Include df.attrs in to_csv output

Enhancement

IO CSVread_csv, to_csvread_csv, to_csv

metadata_metadata, .attrs_metadata, .attrs

Status: Open.

#53577 In pandas-dev/pandas;

· canthonyscott opened on Jun 9, 2023

ENH: Include <code>df.attrs</code> in <code>to_json</code> output

Enhancement

IO JSONread_json, to_json, json_normalizeread_json, to_json, json_normalize

metadata_metadata, .attrs_metadata, .attrs

Status: Open.

#51012 In pandas-dev/pandas;

· janosh opened on Jan 27, 2023

BUG: metadata does not always propagate in binary operations

metadata_metadata, .attrs_metadata, .attrs

Unreliable TestUnit tests that occasionally failUnit tests that occasionally fail

Status: Open.

#49916 In pandas-dev/pandas;

· MarcoGorelli opened on Nov 26, 2022

BUG: concat doesn't preserve attrs (as alternative for append deprecated in 1.4)

API - ConsistencyInternal Consistency of API/BehaviorInternal Consistency of API/Behavior

Enhancement

metadata_metadata, .attrs_metadata, .attrs

Status: Open.

#45824 In pandas-dev/pandas;

· MarcoGorelli opened on Feb 4, 2022