pandas.core.window.Expanding.apply

Expanding.apply(func, args=(), kwargs={}) [source]

expanding function apply

Parameters:

func : function

Must produce a single value from an ndarray input *args and **kwargs are passed to the function

Returns:

same type as input

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Licensed under the 3-clause BSD License.
https://pandas.pydata.org/pandas-docs/version/0.21.1/generated/pandas.core.window.Expanding.apply.html