BUG: fix sort_index with level keyword on single-level RangeIndex#64387
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jQuinRivero wants to merge 3 commits intopandas-dev:mainfrom
Open
BUG: fix sort_index with level keyword on single-level RangeIndex#64387jQuinRivero wants to merge 3 commits intopandas-dev:mainfrom
jQuinRivero wants to merge 3 commits intopandas-dev:mainfrom
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jbrockmendel
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Mar 7, 2026
| na_position=na_position, | ||
| ) | ||
| if isinstance(indexer, ABCRangeIndex): | ||
| indexer = indexer._data |
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is there a fastpath available if we know the indexer is a RangeIndex?
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AssertionError#64383doc/source/whatsnew/v3.1.0.rstDataFrame.sort_indexandSeries.sort_indexraise anAssertionErrorwhencalled with the
levelkeyword on a single-levelRangeIndex. This happensbecause
RangeIndex.sort_values(return_indexer=True)returns aRangeIndexasthe indexer instead of a NumPy array, which then fails an assertion in
BlockManager.reindex_indexer.The fix converts the indexer to a NumPy array in
get_indexer_indexerwhensortlevelreturns aRangeIndex.