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

Parameters :

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’)

Returns :

shifted : Series