In the Absence of a GoTo Statement: Newbie needs menu-launcher to choose amongst sub-programs

[Paul Prescod]

Ron Stephens wrote:
> 
>...
> 
> So, now  I consider procedural menu program using raw_input. Still, how
> do I go to the appropriate sub-program when the user chooses one? With
> goto's this would be trivial. Now, I consider a nested set of "if "
> statements that determines which number was chosen, but still how do I
> "jump" to the correct sub-program??? Even if I define the subprograms as
> functions even, how do I jump to them???

Calling a function is the same as jumping to it. Now there are all kinds
of swank,y k-rad ways to solve your problem more efficiently or
compactly then what I describe below, but I'm trying to keep it simple
so you can learn at your own pace. 

def do_abc():
    "does some stuff"
    #...

def do_def():
    "does some stuff"
    #...

def do_ghi():
    "does some stuff"
    #...

while 1:
    command = raw_input("> ")
    if command == "abc":
        do_abc()
    elif command == "def":
        do_def()
    elif command == "ghi":
        do_ghi()
    elif command == "quit":
        break
    else:
        print "Unknown command"

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