Guide to Creating a Python Application Interface with PyQT6

A detailed guide on how to create a simple application interface using PyQT6 in Python, with installation steps and code explanations.

This guide will show you how to create a simple application interface using PyQT6 in Python. You'll learn how to set up the main window, add basic components, and handle events in the interface.

Python Code

import sys  # System library for interacting with the Python interpreter
from PyQt6.QtWidgets import QApplication, QWidget, QLabel, QVBoxLayout, QPushButton  # Import required classes from PyQt6

# Create a MyApp class that inherits from QWidget
class MyApp(QWidget):
    def __init__(self):
        super().__init__()  # Call the constructor of the parent class QWidget
        self.initUI()  # Call a function to initialize the UI

    def initUI(self):
        self.setWindowTitle('My First PyQT6 App')  # Set the window title
        self.setGeometry(100, 100, 400, 300)  # Set the window's position and size (x, y, width, height)

        # Create a vertical box layout
        layout = QVBoxLayout()

        # Create and add a label to the layout
        self.label = QLabel('Welcome to PyQT6!', self)
        layout.addWidget(self.label)

        # Create and add a button to the layout
        self.button = QPushButton('Click Me', self)
        self.button.clicked.connect(self.onButtonClick)  # Connect the button click event to the onButtonClick function
        layout.addWidget(self.button)

        # Set the main layout for the widget
        self.setLayout(layout)

    # Define the event handler function when the button is clicked
    def onButtonClick(self):
        self.label.setText('You clicked the button!')  # Change the label text

# Main part of the application
if __name__ == '__main__':
    app = QApplication(sys.argv)  # Initialize the QApplication object
    myApp = MyApp()  # Create an instance of MyApp
    myApp.show()  # Display the interface
    sys.exit(app.exec())  # Run the application's event loop

Detailed explanation:

1. import sys: Import the system library to interact with the Python interpreter.
2. from PyQt6.QtWidgets import ...: Import the necessary classes from the PyQt6 library.
3. class MyApp(QWidget): Define the MyApp class inheriting from QWidget.
4. def __init__(self): The constructor of the MyApp class.
5. self.initUI(): Call the initUI function to initialize the user interface.
6. self.setWindowTitle('...'): Set the window title.
7. self.setGeometry(...): Set the window position and size.
8. layout = QVBoxLayout(): Create a vertical box layout.
9. self.label = QLabel('...'): Create a label and add it to the layout.
10. self.button = QPushButton('...'): Create a button and connect the clicked event.
11. self.onButtonClick: Define the function to handle button clicks.
12. app = QApplication(sys.argv): Initialize the application.
13. myApp.show(): Display the application window.
14. sys.exit(app.exec()): Start the application's main event loop.

System Requirements:

• Python 3.9 or higher
• PyQT6

Installation instructions:

Use pip to install PyQt6:

pip install PyQt6

Tips:

• Try modifying the window size, title, and components to better understand how PyQT6 works.
• Explore other layouts such as QHBoxLayout and QGridLayout for more interface design options.