TST: Add regression test for concat with tz_convert MonthStart index#65019
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mroeschke merged 1 commit intopandas-dev:mainfrom Apr 3, 2026
Merged
TST: Add regression test for concat with tz_convert MonthStart index#65019mroeschke merged 1 commit intopandas-dev:mainfrom
mroeschke merged 1 commit intopandas-dev:mainfrom
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…andas-dev#41585) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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…h-origin * upstream/main: (83 commits) PERF: minor optimizations in _libs.algos (pandas-dev#65054) TST: Add roundtrip regression test for to_csv with embedded newlines (pandas-dev#65058) DOC: fix typo in timeseries documentation (ns -> us) (pandas-dev#65070) PERF: use searchsorted in IntervalIndex.get_indexer for monotonic indexes (pandas-dev#64786) PERF : Speed up `merge(sort=False)` for range-like unique integer join keys (left/right joins) (pandas-dev#64148) BUG: exclude RangeIndex from _can_use_libjoin, fix _union sorting (pandas-dev#64797) PERF: read SAS page headers in Cython instead of Python (pandas-dev#64769) BUG: date_range with start==end and inclusive="left"/"right" returns empty (pandas-dev#65014) PERF: restore hash table pre-allocation in value_count (pandas-dev#65027) TST: Add regression test for concat with tz_convert MonthStart index (pandas-dev#65019) BUG: DatetimeIndex._is_comparable_dtype raises AttributeError on Arrow date types (pandas-dev#64953) PERF: avoid expensive DataFrame snapshot in loc.__setitem__ (pandas-dev#65028) BUG: Fix AssertionError in replace with out-of-bounds datetime (pandas-dev#65009) PERF: add no_nans fast path in nancorr (pandas-dev#65046) API/DOC: remove iterability requirement for file-like object + clarify requirements in IO docstrings (pandas-dev#64986) BUG: date_range with periods=1 raises for offsets that disallow n=0 (pandas-dev#65011) CLN: remove using_cow parameter from _iLocIndexer._align_series (pandas-dev#65036) PERF: avoid redundant category re-validation in Categorical._simple_new (pandas-dev#65042) PERF: fix O(n) linear scan in _bin_search for ObjectEngine.get_loc (pandas-dev#65016) CLN: py2 leftover comments mostly (pandas-dev#65025) ...
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Summary
pd.concaton DataFrames with MonthStart-frequency DatetimeIndexes aftertz_convertraisedValueError: Inferred frequency M from passed values does not conform to passed frequency MScloses #41585
Test plan
pytest pandas/tests/reshape/concat/test_datetimes.pypasses🤖 Generated with Claude Code