pandas.errors.SpecificationError

exception pandas.errors.SpecificationError

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