DOC: Document Series reindexing behavior on DataFrame column assignment#64741
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shivamshinde123 wants to merge 1 commit intopandas-dev:mainfrom
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DOC: Document Series reindexing behavior on DataFrame column assignment#64741shivamshinde123 wants to merge 1 commit intopandas-dev:mainfrom
shivamshinde123 wants to merge 1 commit intopandas-dev:mainfrom
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@mroeschke Could you please review this PR? Thanks. |
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doc/source/whatsnew/for new features, deprecations, or behavior changes if applicable (not applicable for docs-only)Summary
Documents the reindexing behavior when assigning a
Seriesto aDataFramecolumn via.locor[]. This behavior (alignment by index labels, not position) was not clearly documented.Changes
pandas/core/indexing.py(locdocstring): Expanded the "Assignment with Series" section with clearer explanation and two examples — one showing index reordering and one showing partial index match withNaNfill.doc/source/user_guide/indexing.rst: Added a new "Series alignment on assignment" subsection under "Setting with enlargement" explaining the four key behaviors with examples.Disclosure
This contribution was made with the assistance of an AI coding tool (Claude Code). The changes have been fully reviewed and verified — all doctest outputs were validated against actual pandas behavior.