Pandas version checks

• I have checked that the issue still exists on the latest versions of the docs on main here

Location of the documentation

"https://pandas.pydata.org/docs/dev/reference/groupby.html"

Documentation problem

There is no reference for DataFrameGroupBy.expanding(), even though it exists in API

E.g. consider working example:

>>> import pandas as pd >>> pd.__version__ '2.2.3' >>> data = {"Class": ["A", "A", "A", "B", "B", "B"],"Value": [10, 20, 30, 40, 50, 60],} >>> df = pd.DataFrame(data) >>> df Class Value 0 A 10 1 A 20 2 A 30 3 B 40 4 B 50 5 B 60 >>> expanding_mean = df.groupby("Class").expanding().mean().reset_index(drop=True) >>> expanding_mean Value 0 10.0 1 15.0 2 20.0 3 40.0 4 45.0 5 50.0 

It's undocumented behaviour

Suggested fix for documentation

Include reference of DataFrameGroupBy.expanding and SeriesGroupBy.expanding, like for DataFrameGroupBy.rolling
and SeriesGroupBy.rolling