BUG: OverflowError when fillna on DataFrame with a pd.Timestamp (#61208) #61216
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…d.Timestamp - Now correctly raises OutOfBoundsDatetime - Added test_fillna_out_of_bounds_datetime()
yuanx749
reviewed
Apr 2, 2025
pandas/core/internals/blocks.py
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| @@ -1749,6 +1749,8 @@ def putmask(self, mask, new) -> list[Block]: | |||
| try: | |||
| # Caller is responsible for ensuring matching lengths | |||
| values._putmask(mask, new) | |||
| except OutOfBoundsDatetime as e: | |||
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| except OutOfBoundsDatetime as e: | |
| except OutOfBoundsDatetime: |
| }) | ||
| df.iloc[0, 0] = None | ||
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|
||
| msg="Cannot cast 0001-01-01 00:00:00 to unit='ns' without overflow" |
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yuanx749
approved these changes
Apr 3, 2025
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Now correctly raises OutOfBoundsDatetime
Added test_fillna_out_of_bounds_datetime()
closes BUG: OverflowError when fillna on DataFrame with a pd.Timestamp #61208
Tests added and passed if fixing a bug or adding a new feature
All code checks passed.
Added type annotations to new arguments/methods/functions. (does not apply)
Added an entry in the latest
doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.Fix for
fillnawith Out-of-Bounds Datetime ValuesIssue: Using
fillnaon adatetime64[ns]column with an out-of-bounds timestamp (e.g.,'0001-01-01') raised anAssertionErrorinstead of the expectedOutOfBoundsDatetime.Fix: Modified the
putmaskmethod inpandas/core/internals/blocks.pyto catch and re-raiseOutOfBoundsDatetimedirectly, preventing theAssertionError.Test Added:
test_fillna_out_of_bounds_datetimeinpandas/tests/frame/methods/test_fillna.py.datetime64[ns]column containingNaT.NaTwith'0001-01-01'.OutOfBoundsDatetime.