DataFrameGroupBy.count()
SeriesGroupBy.nsmallest(*args, **kwargs)
GroupBy.std(ddof=1, *args, **kwargs)
GroupBy.ohlc()
SeriesGroupBy.nunique(dropna=True)
DataFrameGroupBy.pct_change(periods=1, fill_method='pad', limit=None, freq=None, **kwargs) Percent
GroupBy.aggregate(func, *args, **kwargs)
GroupBy.apply(func, *args, **kwargs)
DataFrameGroupBy.cumprod(axis=0, *args, **kwargs)
GroupBy.count()
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