Expanding.apply()
pandas.core.window.Expanding.apply
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Expanding.apply(func, args=(), kwargs={})
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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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© 2008–2014 the pandas development team
Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.core.window.Expanding.apply.html