Series.diff()

pandas.Series.diff

Series.diff(periods=1)

1st discrete difference of object

Parameters:

Parameters:	periods : int, default 1 Periods to shift for forming difference
Returns:	diffed : Series

periods : int, default 1

Periods to shift for forming difference

Returns:

diffed : Series

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Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.Series.diff.html