DataFrame.groupby()
pandas.DataFrame.groupby
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DataFrame.groupby(by=None, axis=0, level=None, as_index=True, sort=True, group_keys=True, squeeze=False, **kwargs)
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Group series using mapper (dict or key function, apply given function to group, return result as series) or by a series of columns.
Parameters: by : mapping function / list of functions, dict, Series, or tuple /
list of column names. Called on each element of the object index to determine the groups. If a dict or Series is passed, the Series or dict VALUES will be used to determine the groups
axis : int, default 0
level : int, level name, or sequ