pandas.Series.shift

Series.shift(periods=1, freq=None, copy=True, **kwds)

Shift the index of the Series by desired number of periods with an optional time offset

periods : int
Number of periods to move, can be positive or negative
freq : DateOffset, timedelta, or offset alias string, optional
Increment to use from datetools module or time rule (e.g. ‘EOM’)

shifted : Series