pandas.Series.cummax

Series.cummax(axis=None, skipna=True, *args, **kwargs) [source]

Return cumulative max over requested axis.

Parameters:

axis : {index (0)}

skipna : boolean, default True

Exclude NA/null values. If an entire row/column is NA, the result will be NA

Returns:

cummax : scalar

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https://pandas.pydata.org/pandas-docs/version/0.19.2/generated/pandas.Series.cummax.html