How to ask the user for input until they give a valid response in Python. Here's one clean way:

• use a while True loop
• use input() to get the user input
• use a try-except block to catch invalid inputs
• use an else block to break if the input is valid

while True:
    try:
        age = int(input("Please enter your age: "))
    except ValueError:
        print("Sorry, I didn't understand that.")
        continue
    else:
        break