Pandas DataFrame groupby() Method. Table Of Contents: Syntax ‘groupby( )’ Method In Pandas. Examples ‘groupby( )’ Method. (1) Syntax: DataFrame.groupby(by=None, axis=0, level=None, as_index=True, sort=True, group_keys=_NoDefault.no_default, squeeze=_NoDefault.no_default, observed=False, dropna=True) Description: Group related records together and apply some aggregate function. 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 compute operations on these groups. Parameters: by: mapping, function, label, or list of labels- Used to determine the groups for the groupby. If by is a function, it’s called on each value of the object’s index. 

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