Mine

def privmsg(self, user, target, msg):
    pieces = msg.split(' ', 1)
    if target == self.channel and len(pieces) and pieces[0][0] == '!':
        mname = 'cmd_' + pieces[0][1:]
        if hasattr(self, mname):
            params = ''
            if len(pieces) > 1: params = pieces[1]
            getattr(self, mname)(user, target, params)