Behaves like the built-in str.split() except returns a
    WordList.
    :rtype: :class:`WordList <WordList>`

def split(self, sep=None, maxsplit=sys.maxsize):
    """Behaves like the built-in str.split() except returns a
    WordList.
    :rtype: :class:`WordList <WordList>`
    """
    return WordList(self._strkey().split(sep, maxsplit), parent=self)