Index.T return the transpose, which is by definition self

DatetimeIndex.weekday_name The name of day in a week (ex: Friday)

DataFrame.loc Purely label-location based indexer for selection by label. .loc[] is primarily label

class pandas.CategoricalIndex

CategoricalIndex.ravel(order='C')

CategoricalIndex.union(other)

CategoricalIndex.format(name=False, formatter=None, **kwargs)

DatetimeIndex.ravel(order='C')

Series.dt.hour The hours of the datetime

Panel.round(decimals=0, *args, **kwargs)