CategoricalIndex.base return the base object if the memory of the underlying data is shared

DatetimeIndex.dayofweek The day of the week with Monday=0, Sunday=6

Panel.kurt(axis=None, skipna=None, level=None, numeric_only=None, **kwargs)

DataFrame.mask(cond, other=nan, inplace=False, axis=None, level=None, try_cast=False, raise_on_error=True)

DataFrame.idxmax(axis=0, skipna=True)

DataFrame.any(axis=None, bool_only=None, skipna=None, level=None, **kwargs)

DataFrame.isnull()

Panel.bfill(axis=None, inplace=False, limit=None, downcast=None)

CategoricalIndex.factorize(sort=False, na_sentinel=-1)

CategoricalIndex.tolist()