Make Series.shift always a copy? · Issue #22397 · pandas-dev/pandas (original) (raw)

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Description

Right now, Series.shift(0) will just return the series. Shifting for all other periods induces a copy:

In [1]: import pandas as pd

In [2]: a = pd.Series([1, 2])

In [3]: a.shift(1) is a Out[3]: False

In [4]: a.shift(0) is a Out[4]: True

Should we defensively copy on 0 as well, for a consistent user experience?