FlyFeditv

📘 Introduction

In this project, you’ll create a command-line Expense Tracker that allows users to:

✅ Add expenses with category, amount, and description
✅ View total spending and category breakdown
✅ Automatically save data to a JSON file
✅ Load and update expense history every time the program runs

This project applies file handling, dictionaries, JSON, loops, and user input.

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🧠 Key Concepts Covered

Concept	Description
JSON Storage	Save and load user data permanently
Dictionaries & Lists	Store expense details cleanly
Functions	Modular, reusable code structure
Data Reports	Calculate totals and category summaries
File Handling	Read/write data to disk

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🧰 Requirements

• Python 3 installed
• Basic knowledge of lists, dictionaries, JSON
• Text editor (VS Code, Notepad++, etc.)

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📌 File Name

expense_tracker.py

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💻 Full Code

import json
import os

DATA_FILE = "expenses.json"

def load_expenses():
    if os.path.exists(DATA_FILE):
        with open(DATA_FILE, "r") as file:
            return json.load(file)
    return []

def save_expenses(expenses):
    with open(DATA_FILE, "w") as file:
        json.dump(expenses, file, indent=4)

def add_expense(expenses):
    amount = float(input("💵 Enter amount: "))
    category = input("📂 Enter category (Food, Transport, etc.): ")
    description = input("📝 Optional note/description: ")
    expenses.append({"amount": amount, "category": category, "desc": description})
    save_expenses(expenses)
    print("✅ Expense added successfully!\n")

def view_summary(expenses):
    if not expenses:
        print("⚠️ No expenses recorded yet.\n")
        return
    
    total = sum(item["amount"] for item in expenses)
    print(f"\n📊 Total Spending: ${total:.2f}")

    category_totals = {}
    for item in expenses:
        category_totals[item["category"]] = category_totals.get(item["category"], 0) + item["amount"]

    print("\n📂 Spending by Category:")
    for cat, amt in category_totals.items():
        print(f" - {cat}: ${amt:.2f}")
    print()

def list_expenses(expenses):
    if not expenses:
        print("⚠️ No expenses found.\n")
        return
    
    print("\n🧾 Expense History:")
    for i, item in enumerate(expenses, 1):
        print(f"{i}. ${item['amount']:.2f} - {item['category']} ({item['desc']})")
    print()

def main():
    expenses = load_expenses()

    while True:
        print("💰 Expense Tracker App")
        print("1. Add Expense")
        print("2. View Summary")
        print("3. List All Expenses")
        print("4. Exit")

        choice = input("👉 Choose an option (1-4): ")

        if choice == "1":
            add_expense(expenses)
        elif choice == "2":
            view_summary(expenses)
        elif choice == "3":
            list_expenses(expenses)
        elif choice == "4":
            print("👋 Goodbye! Data saved.")
            break
        else:
            print("❌ Invalid choice, try again.\n")

if __name__ == "__main__":
    main()

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🧪 Example Output

💰 Expense Tracker App
1. Add Expense
2. View Summary
3. List All Expenses
4. Exit
👉 Choose an option (1-4): 1
💵 Enter amount: 12.50
📂 Enter category (Food, Transport, etc.): Food
📝 Optional note/description: Burger and fries
✅ Expense added successfully!

👉 Choose an option (1-4): 2

📊 Total Spending: $12.50
📂 Spending by Category:
 - Food: $12.50

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🚀 Bonus Extensions

Upgrade	How
✅ Export report to CSV	Use csv module
✅ GUI version	Use Tkinter or PyQt5
✅ Date support	Add datetime.now()
✅ Monthly report	Filter by date range
✅ Pie chart of spending	Use Matplotlib
✅ Convert to Android APK	Using Kivy

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🧠 Summary

✔ You created a real-world expense tracker
✔ Data is saved permanently using JSON
✔ You practiced file I/O, functions, loops, validation
✔ You now have a mini personal finance tool!

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