Pandas DataFrame groupby() Method - W3Schools
https://www.w3schools.com/python/pandas/ref_df_groupby.asp
WEBDefinition and Usage. The groupby() method allows you to group your data and execute functions on these groups. Syntax. dataframe .transform ( by, axis, level, as_index, sort, group_keys, observed, dropna) Parameters. The axis, level , as_index, sort , group_keys, observed , dropna parameters are keyword arguments. Return Value.
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