Asking user input and return to question if wrong input is entered

Question

I'm stuck on a question for an assignment for school. Am i missing something with python

I am running my input's in a while loop and when a value error is thrown. I want to return to the last question asked. but every time it restarts from the beginning of the code.

while True:
    try:
        start_value = int(input('Enter a start value (Default: 0): ') or 0)
        end_value = int(input('Enter a end value: '))
        step_value = int(input('Enter step value (Default: 1): ') or '1')

    except ValueError:
        print('Numeric value only!')
        continue
    else:
        for x in range(start_value, end_value, step_value):
           print(str(x), end=' ')
    break

can anyone point me in the right direction. I have looked all over and only examples i can find are while loops only with one input in the try statement

What do you mean by the "last question asked". Do you mean the answers to the previous inputs? — MoonMist, Nov 19 '19 at 03:02
You should have 3 `while` loops to only repeat the last failed question. — Selcuk, Nov 19 '19 at 03:05
You could also initialize each variable to `None` before the loop. Then check if the value is `None` before asking them to enter the value. — Barmar, Nov 19 '19 at 03:05
in python can you not send it back to the input that throw the except? — Maverick, Nov 19 '19 at 03:19

score 1 · Answer 1 · answered Nov 19 '19 at 03:09

How about using if to control the flow?

i = 0
while True:
    try:
        if i==0:
            start_value = int(input('Enter a start value (Default: 0): ') or 0)
            i=1
        if i==1:    
            end_value = int(input('Enter a end value: '))
            i=2
        if i==2:
            step_value = int(input('Enter step value (Default: 1): ') or '1')

    except ValueError:
        print('Numeric value only!')
        continue
    else:
        for x in range(start_value, end_value, step_value):
           print(str(x), end=' ')
    break

Asking user input and return to question if wrong input is entered

1 Answers1