Qt for Python Quick start

Requirements

Before you can install Qt for Python, first you must install the following software:

• Python 3.6+,

• We recommend using a virtual environment, such as venv or virtualenv

Installation

• Creating and activating an environment You can do this by running the following on a terminal:

  • python -m venv env, (Your Python executable might be called python3)

  • source env/bin/activate for Linux and macOS

  • env\Scripts\activate.bat for Windows

• Installation

  Now you are ready to install the Qt for Python packages using pip. From the terminal, run the following command:

  • pip install pyside6, for the latest version.

  • pip install pyside6==6.0, for the version 6.0 specifically.

  • It is also possible to install a specific snapshot from our servers. To do so, you can use the following command:

    pip install --index-url=http://download.qt.io/snapshots/ci/pyside/6.0.0/latest pyside6 --trusted-host download.qt.io
    

• Test your installation

  Now that you have Qt for Python installed, test your setup by running the following Python constructs to print version information:

  import PySide6.QtCore
  
  # Prints PySide6 version
  print(PySide6.__version__)
  
  # Prints the Qt version used to compile PySide6
  print(PySide6.QtCore.__version__)
  

Create a Simple Application

Your Qt for Python setup is ready. You can explore it further by developing a simple application that prints “Hello World” in several languages. The following instructions will guide you through the development process:

• Imports

  Create a new file named hello_world.py, and add the following imports to it.:

  import sys
  import random
  from PySide6 import QtCore, QtWidgets, QtGui
  

  The PySide6 Python module provides access to the Qt APIs as its submodule. In this case, you are importing the QtCore, QtWidgets, and QtGui submodules.

• Main Class

  Define a class named MyWidget, which extends QWidget and includes a QPushButton and QLabel.:

  class MyWidget(QtWidgets.QWidget):
      def __init__(self):
          super().__init__()
  
          self.hello = ["Hallo Welt", "Hei maailma", "Hola Mundo", "Привет мир"]
  
          self.button = QtWidgets.QPushButton("Click me!")
          self.text = QtWidgets.QLabel("Hello World",
                                       alignment=QtCore.Qt.AlignCenter)
  
          self.layout = QtWidgets.QVBoxLayout(self)
          self.layout.addWidget(self.text)
          self.layout.addWidget(self.button)
  
          self.button.clicked.connect(self.magic)
  
      @QtCore.Slot()
      def magic(self):
          self.text.setText(random.choice(self.hello))
  

  The MyWidget class has the magic member function that randomly chooses an item from the hello list. When you click the button, the magic function is called.

• Application execution

  Now, add a main function where you instantiate MyWidget and show it.:

  if __name__ == "__main__":
      app = QtWidgets.QApplication([])
  
      widget = MyWidget()
      widget.resize(800, 600)
      widget.show()
  
      sys.exit(app.exec())
  

  Run your example by writing the following command: python hello_world.py.

  Try clicking the button at the bottom to see which greeting you get.