DataFrame.diff()
pandas.DataFrame.diff
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DataFrame.diff(periods=1, axis=0)
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1st discrete difference of object
Parameters: periods : int, default 1
Periods to shift for forming difference
axis : {0 or ‘index’, 1 or ‘columns’}, default 0
Take difference over rows (0) or columns (1).
Returns: diffed : DataFrame
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© 2008–2014 the pandas development team
Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.DataFrame.diff.html