The program “Hello World” with PyQT, a module for creating desktop apps. In this article you’ll learn how to create the “hello world” app in PyQt.

If you want to make a desktop app or graphical user interface, PyQT is a good module for that.
Before starting this tutorial, make sure you have PyQt5 installed.

Related Course: Create GUI Apps with Python PyQt5

PyQt Hello World

Example

The program below creates the “hello world” window.

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import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLabel
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import pyqtSlot

def window():
   app = QApplication(sys.argv)
   widget = QWidget()

   textLabel = QLabel(widget)
   textLabel.setText("Hello World!")
   textLabel.move(110,85)

   widget.setGeometry(50,50,320,200)
   widget.setWindowTitle("PyQt5 Example")
   widget.show()
   sys.exit(app.exec_())

if __name__ == '__main__':
   window()

PyQt hello world

If you are new to Python PyQt, then I highly recommend this book.

How it works

PyQT is initialized with the code below:

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app = QApplication(sys.argv)
widget = QWidget()

Text cannot be added immediately to a window. It has to be added to a label.

A label is a widget that can show text or images. These lines create a QLabel, set the labels text and position (horizontal, vertical).

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textLabel = QLabel(widget)
textLabel.setText("Hello World!")
textLabel.move(110,85)

Now you should show the window.

Set the starting position (50,50) and the window size (320,200) with the method setGeometry().

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widget.setGeometry(50,50,320,200)

Then you want to show the window! Give it a title with setWindowTitle() and display it with show().

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widget.setWindowTitle("PyQt5 Example")
widget.show()

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