Basic Calculator Application

Description

This is a basic calculator application built using PyQt5. It includes functionality for basic arithmetic operations and can be operated using both on-screen buttons and keyboard input. This project demonstrates a simple GUI application with event handling in Python. The UI now supports a dark theme for a modern look and reduced eye strain. An application icon is also included.

Features

• Basic arithmetic operations: addition, subtraction, multiplication, and division.
• Clear and backspace functionalities.
• Keyboard input for calculator operations.
• User-friendly graphical interface with dark theme.
• Application icon for a polished look.

Installation

1. Clone the repository:

   git clone https://github.com/your-username/Basic-Calculator.git

2. Change to the project directory:

   cd Basic-Calculator

3. Install the required packages:

   pip install PyQt5

Usage

1. Run the Python script:

   python Basic-Calculator.py

2. Use the on-screen buttons or the keyboard to perform calculations.

Keyboard Shortcuts

• 0-9: Enter numbers
• +: Addition
• -: Subtraction
• *: Multiplication
• /: Division
• (: Open parenthesis
• ): Close parenthesis
• .: Decimal point
• Enter: Calculate result
• Backspace: Remove last character
• ESC: Clear input

How It Works

Code Explanation

The Basic-Calculator.py script is the main Python file for this application. It uses the PyQt5 library to create the GUI. Here is a brief explanation of the code:

1. Importing Libraries: The code starts by importing the necessary modules from PyQt5.

   from PyQt5 import QtCore, QtGui, QtWidgets

2. UI Setup: The Ui_Form class contains the setup for the UI. It defines all the buttons and the input field, and now includes a dark theme and an application icon.

   class Ui_Form(object):
       def setupUi(self, Form):
           Form.setObjectName("Form")
           Form.resize(400, 300)
           self.setWindowIcon(QtGui.QIcon('icon.png'))  # Set application icon
           self.setStyleSheet("background-color: #2e2e2e; color: #f0f0f0;")  # Dark theme
   
           self.lineEdit = QtWidgets.QLineEdit(Form)
           self.lineEdit.setGeometry(QtCore.QRect(10, 10, 381, 41))
           self.lineEdit.setObjectName("lineEdit")
           self.lineEdit.setStyleSheet("background-color: #1e1e1e; color: #ffffff;")
           ...

3. Button Initialization: Each button is initialized with a specific geometry and text label, and styled for the dark theme.

   self.pushButton = QtWidgets.QPushButton(Form, text="7")
   self.pushButton.setGeometry(QtCore.QRect(10, 60, 61, 51))
   self.pushButton.setStyleSheet("background-color: #3e3e3e; color: #ffffff;")

4. Connecting Buttons to Methods: Each button is connected to a method that handles its functionality.

   self.pushButton.clicked.connect(lambda: self.button_clicked("7"))

5. Button Click Handler: The button_clicked method updates the input field with the button's text.

   def button_clicked(self, text):
       current_text = self.lineEdit.text()
       self.lineEdit.setText(current_text + text)

6. Calculation and Clear Functions: The calculate method evaluates the expression in the input field, while the clear method resets it.

   def calculate(self):
       try:
           result = eval(self.lineEdit.text())
           self.lineEdit.setText(str(result))
       except Exception as e:
           self.lineEdit.setText("Error")
   
   def clear(self):
       self.lineEdit.setText("")

7. Keyboard Input Handling: The keyPressEvent method allows the user to use the keyboard for input.

   def keyPressEvent(self, event):
       key = event.key()
       ...

UI and EXE Files

• UI File: The user interface is defined within the Python script itself using PyQt5 widgets and layouts.
• EXE File: The executable file (Basic-Calculator.exe) allows users to run the application without needing to install Python or the required libraries.

Files

• Basic-Calculator.py: The main Python script for the application.
• icon.png: The icon file for the application.
• Basic-Calculator.exe: The executable file for the application (if provided).

Author

Hamed Gharghi

License

This project is licensed under the MIT License - see the LICENSE file for details.

Acknowledgments

• PyQt5 Documentation: https://www.riverbankcomputing.com/static/Docs/PyQt5/

Tags

• Python
• PyQt5
• Calculator
• GUI
• Basic Arithmetic
• Keyboard Input
• Event Handling
• Open Source
• MIT License
• Dark Theme
• Icon

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