PySide is a Pythonbinding of the cross-platformGUI toolkit Qt. It is one of the alternatives to the standard library package Tkinter. Like Qt, PySide is free software. The project started out using Boost.Python from the Boost C++ Libraries for the bindings and later switched to the binding generator Shiboken[2] to reduce the size of the binaries and the memory footprint.
PySide was released under the LGPL in August 2009 by Nokia,[1] the former owners of the Qt toolkit, after Nokia failed to reach an agreement with PyQt developers Riverbank Computing[3] to change its licensing terms to include LGPL as an alternative license.