💰 Expense Tracker

A Python command-line expense tracking application that helps you manage daily expenses by category and subcategory with data persistence using JSON.

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🎯 Features

• ✅ Add expenses by category and subcategory
• ✅ Create your own custom categories
• ✅ Create your own custom subcategories
• ✅ View detailed expense report with subtotals
• ✅ Save data permanently to JSON file
• ✅ Load previous data on startup automatically
• ✅ Error handling for invalid inputs
• ✅ Clean and easy to use menu system

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🛠️ Skills Used

• Python functions
• Nested dictionaries
• JSON file handling
• OS module
• Error handling (try/except)
• While loops
• enumerate()
• f-strings

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📁 Project Structure

expense-tracker/
├── expense_tracker.py    # Main program (all in one file)
├── expenses.json         # Auto-created when you save
└── README.md             # Project documentation

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▶️ How to Run

Requirements

• Python 3.x installed

Steps

# Clone the repository
git clone https://github.com/umer-analysis/expense-tracker.git

# Go to project folder
cd expense-tracker

# Run the program
python expense_tracker.py

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📖 How to Use

=== EXPENSE TRACKER ===
1. Add Expense
2. Show Report
3. Save Data
4. Quit

Choose: 1

Adding an Expense

--- SELECT CATEGORY ---
1. Food
2. Travel
3. Shopping
4. Create my own
Choose: 1

--- SELECT SUBCATEGORY ---
1. Breakfast
2. Lunch
3. Dinner
4. Snacks
5. Create my own
Choose: 2

Amount (Rs): 500
✅ Added Food → Lunch → 500 Rs

Viewing Report

--- EXPENSE REPORT ---

📦 Food
   Lunch    : 500 Rs
   Dinner   : 300 Rs
   Subtotal : 800 Rs

📦 Travel
   Bike     : 200 Rs
   Subtotal : 200 Rs

💰 Total : 1000 Rs

Saving Data

Choose: 3
💾 Data saved!
Goodbye! 👋

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💡 Example Categories

Category	Subcategories
Food	Breakfast, Lunch, Dinner, Snacks
Travel	Bike, Car, Plane, Train
Shopping	Clothes, Electronics, Groceries
Custom	You can create your own! ✅

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🔄 Data Persistence

Data is saved in expenses.json file:

{
    "Food": {
        "Lunch": 500,
        "Dinner": 300
    },
    "Travel": {
        "Bike": 200
    }
}

Every time you run the program →
previous data loads automatically! ✅

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🚀 Future Improvements

• Delete expense feature
• Edit existing expense
• Monthly expense reports
• Export report to Excel
• Budget limit warnings
• Expense categories with colors

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👨‍💻 Author

Umer Farooq

• GitHub : github.com/umer-analysis
• Fiverr : fiverr.com/umer_analysis
• Country : Pakistan 🇵🇰

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📝 License

This project is open source and available for learning purposes.

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⭐ If you found this helpful, please give it a star on GitHub!