pandas.errors.SpecificationError#
- exception pandas.errors.SpecificationError[source]#
Exception raised by
agg
when the functions are ill-specified.The exception raised in two scenarios.
The first way is calling
agg
on a Dataframe or Series using a nested renamer (dict-of-dict).The second way is calling
agg
on a Dataframe with duplicated functions names without assigning column name.Examples
>>> df = pd.DataFrame({'A': [1, 1, 1, 2, 2], ... 'B': range(5), ... 'C': range(5)}) >>> df.groupby('A').B.agg({'foo': 'count'}) ... # SpecificationError: nested renamer is not supported
>>> df.groupby('A').agg({'B': {'foo': ['sum', 'max']}}) ... # SpecificationError: nested renamer is not supported
>>> df.groupby('A').agg(['min', 'min']) ... # SpecificationError: nested renamer is not supported