pandas.Series.shift

Series.shift(self, periods=1, freq=None, axis=0, fill_value=None)[source]

Shift index by desired number of periods with an optional time freq.

When freq is not passed, shift the index without realigning the data. If freq is passed (in this case, the index must be date or datetime, or it will raise a NotImplementedError), the index will be increased using the periods and the freq.

Parameters
periodsint

Number of periods to shift. Can be positive or negative.

freqDateOffset, tseries.offsets, timedelta, or str, optional

Offset to use from the tseries module or time rule (e.g. ‘EOM’). If freq is specified then the index values are shifted but the data is not realigned. That is, use freq if you would like to extend the index when shifting and preserve the original data.

axis{0 or ‘index’, 1 or ‘columns’, None}, default None

Shift direction.

fill_valueobject, optional

The scalar value to use for newly introduced missing values. the default depends on the dtype of self. For numeric data, np.nan is used. For datetime, timedelta, or period data, etc. NaT is used. For extension dtypes, self.dtype.na_value is used.

Changed in version 0.24.0.

Returns
Series

Copy of input object, shifted.

See also

Index.shift

Shift values of Index.

DatetimeIndex.shift

Shift values of DatetimeIndex.

PeriodIndex.shift

Shift values of PeriodIndex.

tshift

Shift the time index, using the index’s frequency if available.

Examples

>>> df = pd.DataFrame({'Col1': [10, 20, 15, 30, 45],
...                    'Col2': [13, 23, 18, 33, 48],
...                    'Col3': [17, 27, 22, 37, 52]})
>>> df.shift(periods=3)
   Col1  Col2  Col3
0   NaN   NaN   NaN
1   NaN   NaN   NaN
2   NaN   NaN   NaN
3  10.0  13.0  17.0
4  20.0  23.0  27.0
>>> df.shift(periods=1, axis='columns')
   Col1  Col2  Col3
0   NaN  10.0  13.0
1   NaN  20.0  23.0
2   NaN  15.0  18.0
3   NaN  30.0  33.0
4   NaN  45.0  48.0
>>> df.shift(periods=3, fill_value=0)
   Col1  Col2  Col3
0     0     0     0
1     0     0     0
2     0     0     0
3    10    13    17
4    20    23    27
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