TST: test that re-using a list of groupers will not throw ValueError #62374
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pd.groupby
seems to mutate mypd.Grouper
in-place #26564Added test to ensure that pd.Grouper is immutable as list item and can be safely reused in different DataFrames. I run the same test on older pandas version (1.3.5) and ensured that the test fails with an error:
ValueError: all keys need to be the same shape