Question

commands = ['chat', 'call', 'exit', 'friends', 'status']

class MainHub(object):
    def menu(self):
        while True:
            selection = raw_input("> ")
            if selection != any(commands):
                print "Not a recognized command!\n"
            else:
                print selection

it prints “Not a recognized command!” everytime, even if selection is something like ‘chat’ or ‘call’. It’s a very simple snippet of code, but I just can’t seem to see what’s wrong with it!

Answer 1

You don’t want the any function, you want the not in syntax:

if selection not in commands:

any is from predicate calculus and checks whether any of its inputs are True. In this case, you’re comparing your input to any(commands), which is True since there is a True element in commands.