Method _open_mh_sequences_file

Lib/mailbox.py:1156–1168

(self, text)

        return len(list(self.iterkeys()))

    def _open_mh_sequences_file(self, text):
        mode = '' if text else 'b'
        kwargs = {'encoding': 'ASCII'} if text else {}
        path = os.path.join(self._path, '.mh_sequences')
        while True:
            try:
                return open(path, 'r+' + mode, **kwargs)
            except FileNotFoundError:
                pass
            try:
                return open(path, 'x+' + mode, **kwargs)
            except FileExistsError:
                pass

    def lock(self):
        """Lock the mailbox."""