Congratulations! You’ve reached the end of the course. It’s time to take everything you’ve learned—Variables, Loops, Logic, Functions, and Lists—and build one real-world application.

The Project: The Personal Expense Tracker

We are going to build a tool that helps a user track their spending and tells them if they are staying within their budget.

🚀 The Requirements:

1. The Goal: Ask the user for their total monthly budget.
2. The Loop: Allow the user to keep adding expenses (description and cost).
3. The Logic: After each expense, tell them how much money they have left.
4. The Exit: If they run out of money, warn them! If they type “done”, show them a summary and exit.

💻 The Final Code (The Solution):

Copy this into your editor to see how a full program looks!

Python

def show_summary(expenses, budget):
    total_spent = sum(expenses)
    remaining = budget - total_spent
    print("\n--- FINAL SUMMARY ---")
    print("Total Budget: $" + str(budget))
    print("Total Spent: $" + str(total_spent))
    print("Remaining: $" + str(remaining))

def main():
    print("Welcome to the Python Expense Tracker!")
    
    # 1. Get the initial budget
    budget = float(input("What is your total budget for this month? "))
    expenses = []
    
    running = True
    while running:
        print("\n--- Current Balance: $" + str(budget - sum(expenses)) + " ---")
        item = input("Enter expense name (or 'done' to finish): ")
        
        if item.lower() == 'done':
            running = False
        else:
            cost = float(input("How much did '" + item + "' cost? "))
            expenses.append(cost)
            
            # Check if over budget
            if sum(expenses) > budget:
                print("⚠️ WARNING: You have exceeded your budget!")

    # 2. Show final results
    show_summary(expenses, budget)

# Start the program
main()

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🎖️ Graduation

You have officially moved from “I want to learn” to “I can build.” You now have a solid foundation in the world’s most popular programming language.

Next Steps for your Website:

• Encourage your readers to change the code (e.g., “Add a feature that categories expenses like ‘Food’ or ‘Rent’”).
• Link to Python.org for further documentation.