pandas.Series.cummax

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

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

See also

pandas.core.window.Expanding.max

Similar functionality but ignores NaN values.