Question

Let’s say you’re asked for input, such as your age, but instead of putting your age in, you accidentally hit ‘enter.’ The program, however, ignores the keystroke and goes to the next step. Your age is not entered but is regarded as empty/null value.

How do you code to fix this problem?

Thank you

Answer 1

With a while loop, you do not need to write the input() function twice:

 while True:
    age = input('>> Age: ')
    if age:
        break
    print('Please enter your age')

You might also check if the input is an integer and get an integer from the string. An empty string for age will also raise a ValueError exception:

while True:
    try:
        age = int(input('>> Age: '))
    except ValueError:
        print('Incorrect input')
        continue
    else:
        break