Restarting loop to iterate over a user string

Question

I'm attempting to accept user input and check the string for non-alphabet values. My problem is if they enter a bad value, how do I query them again and start the loop over? See below

name = str(input("Enter name:"))

for i in name:
     if not i.isalpha():
          name = str(input("Enter name:")
          **line to start iterating from the beginning with new entry.**

Just trying to verify users only enter letters. If the check fails they enter the name again and it starts over. Thanks in advance!

You use a loop until your validation matches... see the duplicate. — Patrick Artner, Aug 01 '19 at 06:13

Paolo Mossini · Answer 1 · 2019-08-01T06:24:29.033

0

You can do something like this:

correct = False
while correct == False:

    name = str(input("Enter name:"))
    for i in name:
        if not i.isalpha():
            correct = False
            break
        else:
            correct = True

edited Aug 01 '19 at 06:24

answered Aug 01 '19 at 06:18

Paolo Mossini

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score 0 · Answer 2 · answered Aug 01 '19 at 06:37

You can see below an example code:

while True:
    number_found = False
    name = str(input("Enter name:"))
    for i in name:
        print("Check {} character".format(i))
        if i.isdigit():
            print("{} is number. Try again.".format(i))
            number_found = True
            break  # Break the for loop when you find the first non-alpha. You can reduce the run-time with this solution.
    if not number_found:
        break
print("Correct input {}".format(name))

Output:

>>> python3 test.py # Success case
Enter name:test
Check t character
Check e character
Check s character
Check t character
Correct input test

>>> python3 test.py # Failed case
Enter name:test555
Check t character
Check e character
Check s character
Check t character
Check 5 character
5 is number. Try again.
Enter name:

Restarting loop to iterate over a user string

2 Answers2