[Python] Aggregate function as an argument

I need to write a function:

def group_and_aggregate_data(dfd.DataFrame, group_by_column:str, agg_func) -> pd.DataFrame


that groups my Excel data by city name and applies the agg_func passed as an argument. I tried this:

def group_and_aggregate_data(dataframe, cond, func):
df_bycity = dataframe.groupby(cond).func()
return df_bycity


but it doesn't work in Python.

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