BUG: Copy attrs on pd.merge() #60357
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This uses the same logic as `pd.concat()`: Copy `attrs` only if all input `attrs` are identical. I've refactored the handling in __finalize__ from special-casing based on th the method name (previously only "concat") to handling "other" parameters that have an `input_objs` attribute. This is a more scalable architecture compared to hard-coding method names in __finalize__. Tests added for `concat()` and `merge()`. Closes pandas-dev#60351.
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timhoffm
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Nov 19, 2024
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| result = result.__finalize__( | ||
| types.SimpleNamespace(input_objs=[self.left, self.right]), | ||
| method=self._merge_type, | ||
| ) |
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Note: I don't really understand why __finalize__ is called twice on the result, once here with method=self._merge_type and once below with method="merge". That looks dubious. If the duplication is needed, we should add a comment.
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This uses the same logic as
pd.concat(): Copyattrsonly if all inputattrsare identical.I've refactored the handling in finalize from special-casing based on th the method name (previously only "concat") to handling "other" parameters that have an
input_objsattribute. This is a more scalable architecture compared to hard-coding method names in finalize.Tests added for
concat()andmerge().Closes #60351.