code: def userinfo(self, username, realname=None):
          
          realname = realname or username
  
          _log.info("Requesting user info update: username=%s realname=%s",
              username, realname)
  
          self.send("USER", username, socket.getfqdn(), self.server.host,
              ":%s" % realname) # Realname should always be prefixed by a colon
          self.user.username = username
          self.user.realname = realname
docs: Set the username and realname for this connection.
  
          Note: this should only be called once, on connect. (The default
          on-connect routine calls this automatically.)