我如何构建我的第一个 Python PET 应用程序（以及我学到的东西）

categories = [
    "Food & Groceries",
    "Transportation (Fuel, Public Transportation, etc...)",
    "Utilities (Electricity, Water, Internet, etc...)",
    "Entertainment & Leisure",
    "Healthcare & Medical Expenses",
    "Rent & Mortgage",
    "Miscellaneous (for any uncategorized expenses)"
]

food = []
transportation = []
utilities = []
entertainment = []
healthcare = []
rent = []
miscs = []

while True:
    while True:
        try:
            choice = int(input("Select category: "))
            if 1 <= choice <= 7:
                break
            else:
                raise ValueError
        except ValueError:
            return "Choose a valid category!"

    while True:
            try:
                amount = float(input("Amount: "))
                break
            except ValueError:
                return "Invalid number! Enter the amount of the expense."

    if choice == 1:
        food.append(amount)
        print(f"${amount} added to {categories[0]}")
    elif choice == 2:
        transportation.append(amount)
        print(f"${amount} added to {categories[1]}")
    elif choice == 3:
        utilities.append(amount)
        print(f"${amount} added to {categories[2]}")
    elif choice == 4:
        entertainment.append(amount)
        print(f"${amount} added to {categories[3]}")
    elif choice == 5:
        healthcare.append(amount)
        print(f"${amount} added to {categories[4]}")
    elif choice == 6:
        rent.append(amount)
        print(f"${amount} added to {categories[5]}")
    elif choice == 7:
        miscs.append(amount)
        print(f"${amount} added to {categories[6]}")

    option = input("Do you want to add another expense? (Y/N)").lower()

    if option != 'y':
        break
    else: 
        continue

food_total = sum(food)
transportation_total = sum(transportation)
utilities_total = sum(utilities)
entertainment_total = sum(entertainment)
healthcare_total = sum(healthcare)
rent_total = sum(rent)
miscs_total = sum(miscs)

print("Options:")
print("[1] View total spent")
print("[2] View total per category")

while True:
    try:
        show_expenses = int(input("Choose an option: "))
        if 1 <= show_expenses <= 2:
            break
        else:
            raise ValueError
    except ValueError:
        return "Invalid! Insert a valid option."

if show_expenses == 1:
    total_expenses = food_total + transportation_total + utilities_total + entertainment_total + healthcare_total + rent_total + miscs_total
    print(f"Your total expenses: ${total_expenses}")
elif show_expenses == 2:
    print(f"{categories[0]} total is: ${food_total}")
    print(f"{categories[1]} total is: ${transportation_total}")
    print(f"{categories[2]} total is: ${utilities_total}")
    print(f"{categories[3]} total is: ${entertainment_total}")
    print(f"{categories[4]} total is: ${healthcare_total}")
    print(f"{categories[5]} total is: ${rent_total}")
    print(f"{categories[6]} total is: ${miscs_total}")