def __len__(self):
        self._lookup()
        return len(self._toc)
`file_tokenize` is a helper function for :meth:`file_corpus`.
dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/_singlefileMailbox.__len__--crossover with--dataset/ETHPy150Open inpho/vsm/vsm/extensions/ldasentences.py/file_tokenize