Replace for Goto

[Gerhard Häring]

Dvm5 wrote:
> I'm used to Basic. There is a Goto/Label command, you put goto where
> you want it to come from and label where you want it to go. Simple.
> How can I do this in Python?

You can't. This is a feature, not a bug ;-) With the control structures 
Python offers (for loops, while loops, functions, exceptions), GOTO is 
not necessary.

Where you'd have used goto in BASIC, you can most of the time find a 
clearer form and use "break" and "continue" statements. For the few 
cases where this is not possible and you don't want to introduce a 
temporary boolean variable, you can use exceptions to break out of 
nested loops, for example.

> What I'm trying to do is create a "play again" type user interface.
> Thus, I can't alter the program to use an If command; the option has
> to be at the end, and the effect has to be at the begining! How do I
> accomplish this?

Use a never-ending while loop, then use an "if" and a "break". Like this:

while 1:
     # do stuff
     answer = raw_input("Want to play again? (y/n)").upper()
     if answer == 'N':
         break

> If there is another way, other than a similar thing to Goto, tell me
> that, as well as a similar thing for goto. It would probably be useful
> later on...

See above. I'd suggest that you learn Python by following one of 
tutorials at http://www.python.org/doc/Newbies.html

These will teach you the Pyhton way of doing things, which is better 
than finding equivalents for what you did in BASIC.

-- Gerhard