Chapter 4: Problem 6

Write an input validation loop that asks the user to enter "Yes" or "No".

Short Answer

Expert verified

Question: Write a program that prompts the user to enter "Yes" or "No" and keeps asking until they enter a valid input. Answer: ```python user_input = input("Please enter 'Yes' or 'No': ") while user_input not in ["Yes", "No"]: print("Invalid input. Please try again.") user_input = input("Please enter 'Yes' or 'No': ") print("You've entered a valid input:", user_input) ```

Step by step solution

Ask the user for input

Begin by asking the user to enter "Yes" or "No" using the input() function. Store the user's input in a variable (e.g. user_input).

Create a while loop

Create a while loop that continues to run as long as the user input is not "Yes" or "No". To do this, use a while statement along with the not in keyword to check if the user input is valid.

Inside the loop, prompt the user for input again

Inside the while loop, print a message letting the user know their input was invalid. Then, prompt the user for input again using the input() function and store the new input in the user_input variable.

End the loop when valid input is received

The loop will continue to run until the user enters a valid input of either "Yes" or "No". Once that happens, the loop condition will be false and the loop will exit. Here's the code implementing these steps: ```python # Step 1: Ask the user for input user_input = input("Please enter 'Yes' or 'No': ") # Step 2: Create a while loop while user_input not in ["Yes", "No"]: # Step 3: Inside the loop, prompt the user for input again print("Invalid input. Please try again.") user_input = input("Please enter 'Yes' or 'No': ") # Step 4: End the loop when valid input is received print("You've entered a valid input:", user_input) ```

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Write an input validation loop that asks the user to enter "Yes" or "No".

Short Answer

Step by step solution

Ask the user for input

Create a while loop

Inside the loop, prompt the user for input again

End the loop when valid input is received

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