DataFrame.groupby doesn't preserve _metadata · Issue #29442 · pandas-dev/pandas (original) (raw)

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Description

I'm following the 0.25.3 documentation on using _metadata.

sdf = SubclassedDataFrame2(my_data_as_dictionary) sdf.added_property = 'hello pandas' df = sdf.groupby('mycategorical')[['myfloat1', 'myfloat2']].sum() print(df.added_property)

The above output produces the result:
AttributeError: 'DataFrame' object has no attribute 'added_property'

added_property is not being "passed to manipulation results" as described in the documentation.