Calculator GUI – Python Tkinter

A simple and beginner-friendly Calculator Application built using Python and the Tkinter GUI toolkit.
This project demonstrates how buttons, events, layouts, and input handling work together in a graphical desktop application.

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📌 Features

• Clean and simple user interface
• Basic arithmetic: +, -, *, /
• Decimal support
• Parentheses support
• Backspace button (←)
• Clear button (C)
• Real-time expression display
• Error-safe evaluation
• Beginner-friendly and easy to modify

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📷 Preview

The calculator window contains:

• A numeric display screen
• Buttons for numbers (0–9)
• Buttons for + - * /
• Buttons for ( and )
• C for clearing
• ← for backspace
• = for calculation

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🧠 How It Works

The app stores the current input in a variable called expression.
Each time a button is pressed, the character is added to the expression and displayed on the screen.

When = is pressed:

python result = str(eval(self.expression)) Python evaluates the entire expression. If something is wrong (like 2++3), the program shows "Error" instead of crashing.

📁 Project Structure graphql Copy code calculator/ │ ├── calculator.py # Main Tkinter GUI script └── README.md # Project documentation 🛠 Requirements Python 3.x

Tkinter (usually pre-installed with Python)

▶️ How to Run Open your terminal or command prompt and run:

bash Copy code python calculator.py The calculator window will appear.

💡 Code Overview 1️⃣ GUI Setup Creates the main window and display entry.

2️⃣ Buttons Buttons are placed using a list of tuples defining:

Button label

Row

Column

3️⃣ Event Handling on_button_click() processes clicks:

= → evaluate

C → clear

← → delete last character

Other buttons → append to expression

4️⃣ Evaluation Done with a simple eval() wrapped in a try-except:

python Copy code try: result = eval(self.expression) except: result = "Error" 🚀 Future Improvements You can upgrade this project with:

Dark/light theme toggle

Scientific calculator buttons

Keyboard input support

History sidebar

Animated/hover buttons

📜 License You are free to use, modify, and distribute this code for learning or personal use.

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