pandas.DataFrame.groupby — pandas 2.3.2 documentation

pandas.DataFrame.groupby# DataFrame.groupby(by=None, axis=<no_default>, level=None, as_index=True, sort=True, group_keys=True, observed=<no_default>, dropna=True)[source]# Group DataFrame using a mapper or by a Series of columns. A groupby operation involves some combination of splitting the object, applying a function, and combining the results. This can be used to group large amounts of data and

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“observedbool, default FalseThis only applies if any of the groupers are Categoricals. If True: only show observed values for categorical groupers. If False: show all values for categorical groupers.”