For question 5 the solution code goes like this user_input = input('Please enter a number type exit to stop:> ') numbers = [] while user_input.lower() != 'exit': while not user_input.isdigit(): print('That is not a number! Numbers only please:> ') user_input = input('Try again:> ') numbers.append(int(user_input)) user_input = input('Please enter next number:> ') total = 0 for number in numbers: total += number Well, I've ran into some problems where I am done inputting my numbers and want to exit but mistyped exit to something else, it goes into the second while loop and is forced to add another number before I could exit. Is there any solution for this?

Hi Jirawut! Great to have you in the course and thanks for reaching out! Can you please support your question with a screenshot containing the entire troubles you’ve encountered? This can help us assist you better. Thank you. Looking forward to your answer. Best, Ivan

Hello, With your solution, once you enter the inner loop you will be stucked here even if you enter 'exit' because you check only if the user_input is digital or not (so 'exit' will be not checked anymore!). We don't need two loops, one isissufficient. Note that I didn't use list in my solution (it is not necessary) but you can change it according what you made for the calculation of the mean.