local variable 'juveniles' referenced before assignment

[Alan Robinson]

On Wednesday, 13 January 2016 12:32:51 UTC, Chris Angelico  wrote:
> On Wed, Jan 13, 2016 at 11:23 PM, Alan Robinson
> <arobinson at lordlawson.org.uk> wrote:
> > def menu():
> >     option = int(input("Please select an option: \n 1: Set Generation 0 Values \n 2: View Generation 0 Values \n 3: Run Model \n 4: Print values"))
> >
> >     if option == 1:
> >         juveniles,adults,seniles = setGen()
> >     elif option == 2:
> >         displayGen()
> >     elif option == 3:
> >         runModel(juveniles,adults,seniles)
> >     elif option == 4:
> >         print(juveniles,adults,seniles)
> >     menu()
> >
> 
> This is a classic use of recursion instead of iteration. When you call
> menu() again, you're creating a completely new 'slot' for the new
> function; it has its own set of names. Assigning to names in one call
> of menu() has no effect on any other call.
> 
> Instead, look into the way a while loop works. You'll find that your
> code is simpler and clearer, plus your variables will stay set.
> 
> ChrisA
thanks I need the menu to run again not sure how to do that though