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DOC: Fixed ES01, PR07, SA04 error in pandas.core.groupby.DataFrameGroupBy.shift #32356

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Merged
merged 3 commits into from
Mar 2, 2020
Merged

DOC: Fixed ES01, PR07, SA04 error in pandas.core.groupby.DataFrameGroupBy.shift #32356

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bd1ddbe
fixed PR07 error in pandas.core.groupby.DataFrameGroupBy.shift
Iqrar99 Feb 29, 2020
515ce8d
fixed PR07 error in pandas.core.groupby.DataFrameGroupBy.shift
Iqrar99 Feb 29, 2020
5a7b947
removed unnecessary lines
Iqrar99 Mar 1, 2020
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11 changes: 10 additions & 1 deletion pandas/core/groupby/groupby.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2312,26 +2312,35 @@ def _get_cythonized_result(
return self._wrap_transformed_output(output)

@Substitution(name="groupby")
@Appender(_common_see_also)
def shift(self, periods=1, freq=None, axis=0, fill_value=None):
"""
Shift each group by periods observations.

If freq is passed, the index will be increased using the periods and the freq.

Parameters
----------
periods : int, default 1
Number of periods to shift.
freq : str, optional
Frequency string.
axis : axis to shift, default 0
Shift direction.
fill_value : optional
The scalar value to use for newly introduced missing values.

.. versionadded:: 0.24.0

Returns
-------
Series or DataFrame
Object shifted within each group.

See Also
--------
Index.shift : Shift values of Index.
tshift : Shift the time index, using the index’s frequency
if available.
"""
if freq is not None or axis != 0 or not isna(fill_value):
return self.apply(lambda x: x.shift(periods, freq, axis, fill_value))
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