Ask interactively for missing command line arguments.

Instead of complaining that the arguments were not given, ask interactively for input.
This example was the only one to behave differently from the others.

examples/muc.py

@@ -11,6 +11,7 @@
 
 import sys
 import logging
+import getpass
 from optparse import OptionParser
 
 import sleekxmpp
@@ -160,9 +161,14 @@ if __name__ == '__main__':
     logging.basicConfig(level=opts.loglevel,
                         format='%(levelname)-8s %(message)s')
 
-    if None in [opts.jid, opts.password, opts.room, opts.nick]:
-        optp.print_help()
-        sys.exit(1)
+    if opts.jid is None:
+        opts.jid = raw_input("Username: ")
+    if opts.password is None:
+        opts.password = getpass.getpass("Password: ")
+    if opts.room is None:
+        opts.room = raw_input("MUC room: ")
+    if opts.nick is None:
+        opts.nick = raw_input("MUC nickname: ")
 
     # Setup the MUCBot and register plugins. Note that while plugins may
     # have interdependencies, the order in which you register them does