Avoid shallow copies in groupby methods #17646
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mroeschke
added
Python
| @@ -3542,6 +3539,13 @@ def keys(self): | |||
| self._key_columns[0], name=self.names[0] | |||
| ) | |||
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| @property | |||
| def values_column_names(self) -> list[Hashable]: | |||
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Suggested change
| def values_column_names(self) -> list[Hashable]: | |
| def _values_column_names(self) -> list[Hashable]: |
Does pandas have this public property? If not, should we just make it a private property?
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It doesn't, so I can make this private
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Description
Noticed while working on #17644 that
diffandfillnawere make some unnecessary shallow copies of thegrouping.valueobject. Also noticed that_cov_or_corrjust pulled the column names out ofgrouping.valueobject, so made a separate API,values_column_namesto just create the column names without pulling out the actual columns.Checklist