Python PyQt5 blank window example

Last update on April 25 2025 12:56:23 (UTC/GMT +8 hours)

Write a Python program to create a blank window using PyQt.

From doc.qt.io:

QApplication Class: The QApplication class manages the GUI application's control flow and main settings.

QMainWindow Class: The QMainWindow class provides a main application window.

Sample Solution:

Python Code:

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow

def main():
    # Create a PyQt application
    app = QApplication(sys.argv)

    # Create a QMainWindow (main window)
    main_window = QMainWindow()

    # Set the window properties (title and initial size)
    main_window.setWindowTitle("Blank Window using PyQt")
    main_window.setGeometry(100, 100, 400, 300)  # (x, y, width, height)

    # Show the window
    main_window.show()

    # Run the application's event loop
    sys.exit(app.exec_())

if __name__ == "__main__":
    main()

Explanation:

In the exercise above -

Import the necessary modules from PyQt5.
Create a 'QApplication' object, which manages the application's control flow and settings.
Create a 'QMainWindow' object, which serves as our main application window.
Set the window's title and initial size using the setWindowTitle and setGeometry methods.
Show the window using "main_window.show()".
Finally, start the application's event loop with app.exec_() to handle user interactions and events.

Output:

Flowchart:

Go to:

Previous: Python PyQt Basic Home.
Next: Python PyQt5 basic application with widgets.

Python Code Editor: