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PySide2/PyQt5 abstraction layer, mulithreading and UI loader utilities, icon set, and more

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Utilities for providing concurrent access to Qt objects, simplified QSettings storage, and dynamic widget promotion when loading UI files, in Python Qt applications. Includes the Fugue icon set, free to use with attribution to Yusuke Kamiyamane.


  • To install the latest release version, run pip install qtutils.

  • To install latest development version, clone the GitHub repository and run pip install . to install, or pip install -e . to install in 'editable' mode.


qtutils is a Python library that provides some convenient features to Python applications using the PyQt5/PySide2 widget library.

qtutils 3.0 dropped support for Python 2.7, PyQt4 and PySide. If you need to use these platforms, you may use qtutils 2.3.2 or earlier.

qtutils contains the following components:

  • invoke_in_main: This provides some helper functions to interact with Qt from threads.

  • UiLoader: This provides a simplified means of promoting widgets in *.ui files to a custom widget of your choice.

  • qsettings_wrapper: A wrapper around QSettings which allows you to access keys of QSettings as instance attributes. It also performs automatic type conversions.

  • icons: An icon set as a QResource file and corresponding Python module. The resulting resource file can be used by Qt designer, and the python module imported by applications to make the icons available to them. The Fugue icon set was made by Yusuke Kamiyamane, and is licensed under a Creative Commons Attribution 3.0 License. If you can't or don't want to provide attribution, please purchase a royalty-free license from

  • Qt: a PyQt5/PySide2 agnostic interface to Qt that allows you to write software using the PyQt5 API but have it run on either PyQt5 or PySide2.

  • outputbox: a QTextEdit widget for displaying log/output text of an application, either by calling methods or by sending data to it over zeromq.

Using icons with Qt designer

To use the icons from Qt designer, clone this repository, and point Qt designer to the .qrc file for the icons set: icons/icons.qrc. Unfortunately Qt desginer saves the absolute path to this file in the resulting .ui file, so if the .ui file is later edited by someone on another system, they will see an error at startup saying the .qrc file cannot be found. This can be ignored and the .ui file will still function correctly, but Qt designer will need to be told the local path to the .qrc file before it can display the icons within its interface.

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