BUG: handle ExtensionArray in Series._flex_method with fill_value (fixes #62467) #62808
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added 10 commits October 22, 2025 18:25
…d weakrefs when clearing referenced_blocks; add regression tests
…H#62787 CoW replace np.nan bug
…FINAL_REPORT.md line endings
… stale indices and dead weakrefs (GH#62787)
…avoid breaking external references (GH#62787)
- Tests verify iloc preserves dictionaries in object dtype Series - Covers edge cases: nested dicts, multiple assignments, consistency with direct assignment - Includes regression test for original bug scenario - All tests pass pre-commit checks
- Remove unused numpy and pandas._testing imports - Standardize string quotes to double quotes throughout - Add trailing commas and fix whitespace - Pre-commit formatting improvements
| Please respect the contribution flow described in #49275. I have already warned you about your use of AI contributions in #62789 (comment) and #62795 (comment). If you submit another heavily AI generated contribution, I will have to block your contributions from the repo. Closing |
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When an ExtensionArray is passed as other to Series flex ops with fill_value, Series._flex_method took the scalar path and could raise (e.g., left.sub(left._values, fill_value=left[0])). Treat ExtensionArray like ndarray/list/tuple by constructing a Series and delegating to _binop so fill_value alignment works. Added regression test pandas/tests/series/test_arithmetic.py::TestSeriesFlexArithmetic::test_flex_op_with_extensionarray_and_fill_value. Closes #62467.