Python 3: Returning variable through multiple functions

Question

I have been given a basic python problem that requires me to make a simple addition quiz. However, I cannot seem to return my count variable which is supposed to update the number of correct questions the user has answered, which makes it stuck at 0. I have tried defining the variable count in every function containing it as an argument but still does not work. Say if the user were to answer 4 questions and got 3 correct, it would display it as "You have answered 4 questions with 3 correct", but instead it displays "You have answered 4 questions with 0 correct".

Answer 1

Every time your check_solution and menu_optionfunctions get called, you initialize count = 0. This means every time the user requests another question, count gets reset to 0, twice. You're going to want to remove those count = 0 calls, and you also want to capture your updates to count within menu_option. Your final program should look something like this:

import random

def get_user_input():
    count = 0
    user_input = int(input("Enter 1 to play or press 5 to exit: "))
    while user_input > 5 or user_input <= 0:
        user_input = int(input("Invalid menu option. Try again: "))
        menu_option(user_input, count)

        if user_input == "5":
            print("Exit!")

    return user_input

def get_user_solution(problem):
    answer = int(input(problem))
    return answer

def check_solution(user_solution, solution, count):
    curr_count = count
    if user_solution == solution:
        curr_count += 1
        print("Correct.")

    else:
        print("Incorrect.")
    print(curr_count)
    return curr_count

def menu_option(index, count):
    if index == 1:
        num1 = random.randrange(1, 21)
        num2 = random.randrange(1, 21)
        randsum = num1 + num2
        problem = str(num1) + " " + "+" + " " + str(num2) + " " + "=" + " "
        user_answer = get_user_solution(problem)
        count = check_solution(user_answer, randsum, count) # count returned by check_solution is now being captured by count, which will update your count variable to the correct value

    return count

def display_result(total, correct):
    if total == 0:
        print("You answered 0 questions with 0 correct.")
        print("Your score is 0%. Thank you.")
    else:
        score = round((correct / total) * 100, 2)
        print("You answered", total, "questions with", correct, "correct.")
        print("Your score is", str(score) + "%.")

def main():
    option = get_user_input()
    total = 0
    correct = 0
    while option != 5:
        total = total + 1
        correct = menu_option(option, correct)
        option = get_user_input()

    print("Exiting.")
    display_result(total, correct)

main()