Series.ndim return the number of dimensions of the underlying data, by definition 1

GroupBy.sem(ddof=1)

Series.itemsize return the size of the dtype of the item of the underlying data

DataFrame.pivot(index=None, columns=None, values=None)

DataFrame.sort_index(axis=0, level=None, ascending=True, inplace=False, kind='quicksort', na_position='last', sort_remaining=True, by=None)

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

MultiIndex.is_(other)

TimedeltaIndex.argmin(axis=None, *args, **kwargs)

TimedeltaIndex.tolist()

TimedeltaIndex.shape return a tuple of the shape of the underlying data