Dealing with errors in input

[souprqtpie]

There are a number of ways you can deal with this. You could do two separate inputs to get the different numbers. You could be explicit about needing a space. You could replace other common delimiters with spaces before splitting (input('Enter two numbers: ').replace(',', ' ').split()). You could write a regular expression matching valid numbers, and use findall to get a list of valid numbers in the input.

If you want to give multiple chances to correct the input, a while True loop is often used:

while True:
    values = input('Enter two numbers: ')
    try:
        # to convert to integer
    except ValueError:
        print('Invalid input')
    else:
        break

Instead of (or in addition to) the try/except block, you might check for a valid range or other issues with if/else, again breaking if the input is valid.

thanks for the answer!
could you explain the replace bit to me in a little more detail please showing how it works. ( I am trying to keep both numbers on the same input line). I've done the while true loop before, but I didn't know how to get it to measure both numbers at once without making a separate loop for each one