def join(self, who, where):
        """
        Send a join message.

        @type who: C{str} or C{unicode}
        @param who: The name of the user joining.  Should be of the form
            username!ident@hostmask (unless you know better!).

        @type where: C{str} or C{unicode}
        @param where: The channel the user is joining.
        """
        self.sendLine((who, where) % ":%s JOIN %s")
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/words/protocols/irc.py/IRC.join/swapped operands of `%`