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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Licensed under the 3-clause BSD License.
https://pandas.pydata.org/pandas-docs/version/0.19.2/generated/pandas.Series.cummax.html