main.py

import csv
import json

valid_symbols = "abcdefghijklmnopqrstuvwxyz"
correct_answer_count = 0
incorrect_answer_count = 0
total_questions = 10
valid_answers = ["a", "b", "c", "d"]
quiz_results = []

# username validation to prevent file creation errors
username = input("Please enter your name: ")
for symbol in username:
    if symbol not in valid_symbols:
        print("Please use only latin letters for your name.")
        exit()

# this handler checks if the input is valid, and if the user wants to quit
def input_handler(user_input):
    if user_input.strip().lower() == "quit" or user_input.strip().lower() == "exit":
        print_results()
        exit()
    if user_input.strip().lower() not in valid_answers:
        print("\nError: Invalid input.")
        print("You should enter only one letter (a - d) corresponding to the answer.")
        return False
    return True

def calculate_score(correct_answer_count):
    temp = correct_answer_count / total_questions * 100
    if temp >= 90 or temp <= 100:
        return "Excellent!"
    elif temp >= 70 or temp < 90:
        return "Good job!"
    elif temp >= 50 or temp < 70:
        return "You passed!"
    else:
        return "Better luck next time!"

def print_results():
    print("The quiz is over!")
    print(f"Results for user {username}:")
    print(f"Correct answers: {correct_answer_count}")
    print(f"Incorrect answers: {incorrect_answer_count}")
    print(calculate_score(correct_answer_count))

def save_results_to_csv():
    filename = username.lower().replace(" ", "_") + "_quiz_results.csv"
    with open(filename, mode='w', newline='') as file:
        writer = csv.writer(file)
        writer.writerow(["Question Number", "Question Text", "User's Answer", "Correct Answer", "Result"])
        writer.writerows(quiz_results)
    print(f"Quiz results saved to {filename}")

with open("quiz.json", "r") as file:
    quiz_json = json.load(file)

# main quiz logic
for key, value in quiz_json["quiz"].items():
    # key[8:] is used to omit the "question" part in "question1", "question2" and so on
    print(f"Question {key[8:]}:", value["question"])
    for option, answer in value["options"].items():
        print(option + ": " + answer)
    user_input = input("Enter your answer: ")

    # loop that requires the user to input a valid answer
    while not input_handler(user_input):
        user_input = input("Enter your answer: ")

    # check the answer
    if user_input.lower().strip() == value["correct_answer"]:
        correct_answer_count += 1
        is_correct = True
        print("\nCorrect!\n")
    else:
        incorrect_answer_count += 1
        is_correct = False
        print("\nWrong answer.")
        print(f"The correct answer is: {value["correct_answer"]}\n")

    quiz_results.append([
        key[8:],
        value["question"],
        user_input.lower().strip(),
        value["correct_answer"],
        "Correct" if is_correct else "Incorrect" # ternary operator
    ])

print_results()
save_results_to_csv()