'Alters flag dispositions for messages in mailbox.
(typ, [data]) = <instance>.store(message_set, command, flags)'

def store(self, message_set, command, flags):

    if ((flags[0], flags[(-1)]) != ('(', ')')):
        flags = ('(%s)' % flags)
    (typ, dat) = self._simple_command('STORE', message_set, command, flags)
    return self._untagged_response(typ, dat, 'FETCH')
