Question

At the moment I have a check to see if a string has specific characters in it.

I am trying to find a work around for a ‘Goto’ function.

This is what I have at the moment:

chars = set('0123456789$,')

if any((c in chars) for c in UserInputAmount):
    print 'Input accepted'
else:
    print 'Invalid entry. Please try again'

I just need Python to go back to the string input of ‘UserInputAmount’ if the entry is invalid. A push in the right direction would be appreciate.

Answer 1

You don’t need a goto, you just need a loop. Try this, which loops forever unless the user provides valid input:

chars = set('0123456789$,')

while True: # loop "forever"
    UserInputAmount = raw_input() # get input from user

    if any((c in chars) for c in UserInputAmount):
        print 'Input accepted'
        break # exit loop

    else:
        print 'Invalid entry. Please try again'
        # input wasn't valid, go 'round the loop again