Runs a userhost on a nick.
        Required arguments:
        * nick - Nick to run a userhost on.

def userhost(self, nicks):
        """
        Runs a userhost on a nick.
        Required arguments:
        * nick - Nick to run a userhost on.
        """
        with self.lock:
            self.send('USERHOST :%s' % nicks)
            userhosts = []
            if self.readable():
                msg = self._recv(expected_replies=('302',))
                if msg[0] == '302':
                    userhosts = msg[2].replace(':', '', 1).split()
            return userhosts