Basic Calculator Using Python (GUI Based)

This project demonstrates the creation of a basic calculator application with a graphical user interface (GUI) using Python and PyQt5. The calculator allows users to perform simple arithmetic operations such as addition, subtraction, multiplication, and division.

Tech Stack

• Python: The core programming language used for building the application.
• PyQt5: A Python library for creating desktop applications with graphical user interfaces. PyQt5 is used to design and implement the calculator's GUI components.

Project Structure

The project is organized into several modules, each serving a specific purpose:

1. test.py: Initializes the PyQt5 application, creates a window, and displays a simple "hello" message to verify the window functionality.

2. view.py: Defines the GUI layout and appearance of the calculator using PyQt5 widgets, including QMainWindow, QLineEdit, QGridLayout, QPushButton, QVBoxLayout, and QWidget. It creates a display bar to show entered digits and positions buttons in the calculator layout.

3. main.py: Contains the main function that sets up the application, creates an instance of QApplication, and displays the GUI by calling the GUI() and show() methods.

4. model.py: Implements the logic for evaluating mathematical expressions entered by the user. It defines the evaluateExpression method to perform the calculation and handle exceptions.

5. controller.py: Manages the interactions between the model and view. The Controller class connects user input from the GUI (buttons) to the expression-building logic. It includes functions for calculating results, building expressions, and connecting signals.

Usage

To run the calculator application:

1. Ensure you have Python installed on your system.

2. Install the required libraries using pip: (pip install pyqt5),(-sudo apt-get install python3- controller), model, view etc:

Features

Basic arithmetic operations (+, -, *, /) ,Decimal support, Error handling for invalid expressions.

Future Work

Add more advanced features, such as trigonometric functions and support for parentheses, Improve the user interface, Add documentation and tests.

Author

devanshu3