error if unknown command

bot.py

@@ -88,8 +88,11 @@ class TestBot(irc.bot.SingleServerIRCBot):
             end = 'Available commands are: help, uptime, ram, cpu, uname, network, temp'
             c.notice(nick, end)
 
-
+        else:
+            end = 'Unknow command. Sorry'
+            c.notice(nick, end)
 def main():
+ #   print(argv)
     if len(argv) != 4:
         print('Usage: {} channel nickname server'.format(argv[0]))
         exit(1)
@@ -99,6 +102,5 @@ def main():
     bot = TestBot(channel, nickname, server)
     bot.start()
 
-
 if __name__ == "__main__":
     main()