This is PySide tutorial. The tutorial is suited for beginners and intermediate programmers. After reading this tutorial, you will be able to program nontrivial PySide applications.
PySide is Python library to create cross-platform graphical user interfaces. It is a Python binding to the Qt framework. Qt library is one of the most powerful GUI libraries. It is developed by Nokia.
There is a full Python tutorial on ZetCode. Tutorials for other GUI Python bindings include PyQt4 tutorial, wxPython tutorial, PyGTK tutorial and Tkinter tutorial.