Exam-style question
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Write Python code that repeatedly asks the user for a whole number. If the input cannot be converted to an integer, the program should display a message and ask again. When a valid integer is entered, the loop should stop.
Model answer
What a good answer should say
- valid = False while not valid: try: number = int(input("Enter a whole number: ")) valid = True except: print("That input is not a whole number.
- Try again.")
Explanation
Why this works
The conversion of the input is placed in the try block because it may cause an exception. If an exception occurs, the except block displays a message and valid remains False, so the loop repeats.
When conversion succeeds, valid becomes True and the loop stops.
Common mistake
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