A GUI-based calculator application built with Python and Tkinter.
- Python 3.x with Tkinter support
- Windows, macOS, or Linux
- Ensure Python is installed on your system
- Run the calculator:
python simple_calculator.py
- Addition (
+) - Subtraction (
-) - Multiplication (
*) - Division (
/) - Square function (
x²)
- Mouse: Click buttons to input numbers and operations
- Keyboard: Type directly using number keys, operators, and decimal point
- Clipboard: Paste numbers using Ctrl+V (or Cmd+V on macOS)
- Prevents multiple decimal points in a single number
- Removes unnecessary leading zeros
- Supports negative numbers with leading minus sign
- Limits numbers to 15 significant digits for accuracy
- C: Clear all input
- DEL: Delete last character (backspace)
- =: Calculate result
- x²: Square the current number
| Key | Action |
|---|---|
0-9 |
Input digits |
+ - * / |
Mathematical operators |
. |
Decimal point |
Enter |
Calculate (equals) |
Backspace |
Delete last character |
Escape |
Clear all |
Ctrl+V |
Paste number |
- Shows "Error" for invalid expressions
- Blocks input when error is displayed until cleared
- Validates pasted content to ensure only numbers are accepted
The calculator features a modern dark theme with:
- Large, easy-to-read display
- Color-coded buttons (numbers, operators, functions)
- Hover effects for better user interaction
- Responsive button layout
- Uses Python's
eval()function for calculations on sanitized input - Input validation prevents code injection
- Results are formatted to maintain readability
- Supports both integer and floating-point arithmetic
Calculator won't start:
- Ensure Python is installed and accessible from command line
- Check that Tkinter is available (
python -m tkintershould open a test window)
Keyboard input not working:
- Click on the calculator window to ensure it has focus
- Try clicking in the display area first
Paste not working:
- Only plain numbers (with optional +/- sign) can be pasted
- Complex expressions cannot be pasted for security reasons