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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def version(self):
 """ The memcached "version" command. Returns: A string of the memcached version. """

        cmd = b"version\r\n"
        results = self._misc_cmd([cmd], b'version', False)
        before, _, after = results[0].partition(b' ')

        if before != b'VERSION':
            raise MemcacheUnknownError(
                "Received unexpected response: %s" % results[0])
        return after