PyQt
Python and Qt.svg
Screenshot-qt-designer-qwebview.png
Developer(s)Riverbank Computing
Stable release
6.2.2[1] Edit this on Wikidata / 2 December 2021; 5 months ago (2 December 2021)
Written inC++ / Python[2]
Operating systemCross-platform
LicenseGNU GPL and commercial
Websiteriverbankcomputing.com

PyQt is a Python binding of the cross-platform GUI toolkit Qt, implemented as a Python plug-in. PyQt is free software developed by the British firm Riverbank Computing. It is available under similar terms to Qt versions older than 4.5; this means a variety of licenses including GNU General Public License (GPL) and commercial license, but not the GNU Lesser General Public License (LGPL).[3] PyQt supports Microsoft Windows as well as various flavours of UNIX, including Linux and MacOS (or Darwin).[4]

PyQt implements around 440 classes and over 6,000 functions and methods[5] including:

To automatically generate these bindings, Phil Thompson developed the tool SIP, which is also used in other projects.

In August 2009, Nokia, the then owners of the Qt toolkit, released PySide, providing similar functionality, but under the LGPL,[8] after failing to reach an agreement with Riverbank Computing[9] to change its licensing terms to include LGPL as an alternative license.

PyQt main components

Alternative PyQt logo
Alternative PyQt logo

PyQt4 contains the following Python modules.

PyQt5 contains the following Python modules:

Versions

PyQt version 4 works with both Qt 4 and Qt 5. PyQt version 5 only supports Qt version 5,[4] and drops support for features that are deprecated in Qt 5.[11]

Hello World example

The below code shows a small window on the screen.

PyQt4

The result in KDE Plasma 4
The result in KDE Plasma 4
#! /usr/bin/env python3
# Character Encoding: UTF-8
#
# Here we provide the necessary imports.
# The basic GUI widgets are located in QtGui module.
import sys
from PyQt4.QtGui import QApplication, QWidget

# Every PyQt4 application must create an application object.
# The application object is located in the QtGui module.
app = QApplication(sys.argv)

# The QWidget widget is the base class of all user interface objects in PyQt4.
# We provide the default constructor for QWidget. The default constructor has no parent.
# A widget with no parent is called a window.
root = QWidget()

root.resize(320, 240)  # The resize() method resizes the widget.
root.setWindowTitle("Hello, World!")  # Here we set the title for our window.
root.show()  # The show() method displays the widget on the screen.

sys.exit(app.exec_())  # Finally, we enter the mainloop of the application.

PyQt5

#! /usr/bin/env python3
# Character Encoding: UTF-8
#
# Here we provide the necessary imports.
# The basic GUI widgets are located in QtWidgets module.
import sys
from PyQt5.QtWidgets import QApplication, QWidget

# Every PyQt5 application must create an application object.
# The application object is located in the QtWidgets module.
app = QApplication([])

# The QWidget widget is the base class of all user interface objects in PyQt5.
# We provide the default constructor for QWidget. The default constructor has no parent.
# A widget with no parent is called a window.
root = QWidget()

root.resize(320, 240)  # The resize() method resizes the widget.
root.setWindowTitle("Hello, World!")  # Here we set the title for our window.
root.show()  # The show() method displays the widget on the screen.

sys.exit(app.exec_())  # Finally, we enter the mainloop of the application.

PyQt6

#! /usr/bin/env python3
# Character Encoding: UTF-8
#
# Here we provide the necessary imports.
# The basic GUI widgets are located in QtWidgets module.
import sys
from PyQt6.QtWidgets import QApplication, QWidget

# Every PyQt6 application must create an application object.
# The application object is located in the QtWidgets module.
app = QApplication([])

# The QWidget widget is the base class of all user interface objects in PyQt6.
# We provide the default constructor for QWidget. The default constructor has no parent.
# A widget with no parent is called a window.
root = QWidget()

root.resize(320, 240)  # The resize() method resizes the widget.
root.setWindowTitle("Hello, World!")  # Here we set the title for our window.
root.show()  # The show() method displays the widget on the screen.

sys.exit(app.exec())  # Finally, we enter the mainloop of the application.

Notable applications that use PyQt

See also

References

  1. ^ "PyQt v6.2.2 Released". 2 December 2021. Retrieved 28 December 2021.
  2. ^ "PyQt4 Download". Riverbankcomputing. 2010. Retrieved 2010-04-19.
  3. ^ "Riverbank | Commercial | License FAQ". Riverbankcomputing.com. Retrieved 2015-06-24.
  4. ^ a b "What is PyQt?". Riverbank Computing. Retrieved 2014-09-18.
  5. ^ "PyQt v4 - Python Bindings for Qt v4". Riverbankcomputing. Archived from the original on 2008-04-29. Retrieved 2010-04-17.
  6. ^ "QSqlDatabase Class Reference". Pyqt.sourceforge.net. Retrieved 2014-09-25.
  7. ^ PythonInfo Wiki
  8. ^ "PySide has been released – PySide – Python for Qt". Pyside.org. 2009-08-18. Archived from the original on 2009-10-25. Retrieved 2009-09-03.
  9. ^ "FAQ – PySide – Python for Qt". Pyside.org. Retrieved 2009-09-03.
  10. ^ "Riverbank | Software | PyQt | What is PyQt?". Riverbankcomputing.co.uk. Retrieved 2010-04-15.
  11. ^ "Differences Between PyQt4 and PyQt5", PyQt 5.3.2 Reference Guide

Further reading