Getting started| pandas.pydata.org
rightDataFrame or named SeriesObject to merge with.| pandas.pydata.org
Source code: Lib/functools.py The functools module is for higher-order functions: functions that act on or return other functions. In general, any callable object can be treated as a function for t...| Python documentation
bymapping, function, label, pd.Grouper or list of suchUsed to determine the groups for the groupby.| pandas.pydata.org