app.py

# Function to display the main menu
def show_menu():
    print("===== Personal Expense Tracker =====")
    print("1. Add an Expense")
    print("2. View All Expenses")
    print("3. Show Total Spending")
    print("4. View Spending by Category")
    print("5. Exit")
    print("====================================")

# Function to add a new expense
def add_expense(expenses):
    category = input("Enter category (Food, Travel, Shopping, etc.): ").capitalize()
    amount = float(input("Enter amount spent: "))
    note = input("Enter a short note (optional): ")

    expense = {
        "category": category,
        "amount": amount,
        "note": note
    }
    expenses.append(expense)
    print(f"✅ Expense added: {category} - ₹{amount}")

# Function to view all expenses
def view_expenses(expenses):
    # Check if there are no expenses yet
    if len(expenses) == 0:
        print("\nNo expenses recorded yet! Start by adding one.")
        return

    # If we have expenses, show them nicely
    print("\n----- Your Expenses -----")
   
    # Create a counter to keep track of numbering
    count = 1
    # Loop through each expense in the list
    for expense in expenses:
        category = expense["category"]
        amount = expense["amount"]
        note = expense["note"]

        print(f"{count}. Category: {category} | Amount: {amount} | Note: {note}")
        count += 1 


# Function to show total spending
def total_spending(expenses):
    # Check if there are no expenses yet
    if len(expenses) == 0:
        print("No expenses recorded yet! Add some first.")
        return

    # Start total from 0
    total = 0

    # Go through each expense and add the amount to total
    for expense in expenses:
        total = total + expense["amount"]

    # Show the final total
    print(f"\n💰 Total spending so far: ₹{total}")


# Function to view spending by category
def spending_by_category(expenses):
   # Check if there are no expenses yet
    if len(expenses) == 0:
        print("\nNo expenses to analyze! Add some first.")
        return

    category_totals = {}
    for expense in expenses:
        category = expense['category']
        amount = expense["amount"]
        
       # If this category already exists, add to it
        if category in category_totals:
            category_totals[category] = category_totals[category] + amount
        else:
            # Otherwise, start a new category total
            category_totals[category] = amount


    print("\n📊 Spending by Category:")
    for category, total in category_totals.items():
        print(f"- {category}: {total}")

# -----------------------------
# Main Program
# -----------------------------
def main():
    expenses = []

    while True:
        show_menu()
        choice = input("Choose an option (1-5): ")

        if choice == '1':
            add_expense(expenses)
        elif choice == '2':
            view_expenses(expenses)
        elif choice == '3':
            total_spending(expenses)
        elif choice == '4':
            spending_by_category(expenses)
        elif choice == '5':
            print("👋 Exiting Expense Tracker. Have a great day!")
            break
        else:
            print("❌ Invalid choice. Please try again.")

# Run the program
if __name__ == "__main__":
    main()