Pandas 0.18
Pandas 0.18
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Series.ptp()

pandas.Series.ptp

Series.ptp(axis=None, skipna=None, level=None, numeric_only=None, **kwargs)
Returns the difference between the maximum value and the
minimum value in the object. This is the equivalent of the numpy.ndarray method ptp.
Parameters:

axis : {index (0)}

skipna : boolean, default True

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

level : int or level name, default None

If the axis is a MultiIndex (hierarchical), count along a particular level, collapsing into a scalar

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