Series.
hasnans
Return True if it has any missing values. Otherwise, it returns False.
>>> ps.DataFrame({}, index=list('abc')).index.hasnans False
>>> ps.Series(['a', None]).hasnans True
>>> ps.Series([1.0, 2.0, np.nan]).hasnans True
>>> ps.Series([1, 2, 3]).hasnans False
>>> (ps.Series([1.0, 2.0, np.nan]) + 1).hasnans True
>>> ps.Series([1, 2, 3]).rename("a").to_frame().set_index("a").index.hasnans False