Series.cat.codes

Series.align(other, join='outer', axis=None, level=None, copy=True, fill_value=None, method=None, limit=None, fill_axis=0, broadcast_axis=None)

Series.__iter__()

Series.dt.weekofyear The week ordinal of the year

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

Series.str.split(pat=None, n=-1, expand=False)

Series.swaplevel(i=-2, j=-1, copy=True)

Series.empty True if NDFrame is entirely empty [no items], meaning any of the axes are of length 0.

Series.nsmallest(*args, **kwargs)

Series.str.upper()