Series.xs(key, axis=0, level=None, drop_level=True)

Series.to_hdf(path_or_buf, key, **kwargs)

Series.dt.daysinmonth The number of days in the month New

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

Series.str.isdigit()

Series.mode()

Series.axes Return a list of the row axis labels

Series.str.replace(pat, repl, n=-1, case=True, flags=0)

Series.memory_usage(index=True, deep=False)

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