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Chapter 4: Problem 6

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

Short Answer

Expert verified
Answer: The while loop ensures that the user will be repeatedly prompted for input until they provide a valid response (either "Yes" or "No"). It continues running only if the user's input is not valid, and ends when a valid input is entered.

Step by step solution

01

1. Initialize a variable for the user input

First, let's create a variable to store the user's input. We can call this variable 'user_input'. Initially, you can set its value to an empty string.
02

2. Create the input validation loop

Now, we'll write a while loop that continues to prompt the user for input until they enter a valid response. In this case, we want the loop to continue running if the user input does not equal "Yes" and does not equal "No". To achieve this, we can use the following condition in our while loop: ´´´ while user_input != "Yes" and user_input != "No": ´´´
03

3. Prompt the user for input during each loop iteration

Inside the while loop, let's prompt the user for input using the input() function and store the result in the 'user_input' variable. Here's the code for this step: ´´´ user_input = input("Please enter 'Yes' or 'No': ") ´´´
04

4. End the loop when the user provides a valid input

Since the while loop is set up to only continue running if the user's input is not valid, it will automatically end when they enter either "Yes" or "No". After the loop, you may want to include a print statement to confirm that the input was valid, like so: ´´´ print("You entered a valid response:", user_input) ´´´ Using these steps, your complete code should look like this: ```python user_input = "" while user_input != "Yes" and user_input != "No": user_input = input("Please enter 'Yes' or 'No': ") print("You entered a valid response:", user_input) ```

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Most popular questions from this chapter

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