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a much better way to write GUI apps in Python is to use Trolltech's QT Designer to WYSIWYG-ly create a nice-looking interface, and then automatically generate the necessary code for it with pyuic (which is a UI compiler for QT that comes with the PyQT package.)

From PyQt4.6, PyQt has two APIs, API#1 (the original), and API#2 (new). API#2 is more Pythonic and eliminates QString and QVariant, and is a bit nicer to use. API#1 remains best for those using PyQt to prototype C++/Qt applications. API#1 is the default for PyQt4.x with Python 2.x, and for PyQt4.0-4.5 with Python 3.x. API#2 is the default for PyQt4.6+ with Python 3.x, and for PySide.

most of the changes affect uses of QDataStream, QSettings, and QTextStream, and of course any use of QString methods (since in API#2, QString is gone, so we use str).

To convert any particular example to PySide the steps are as follows: Replace python3 in the first line with python. Add the following statements before the first import: from __future__ import division from __future__ import print_function from future_builtins import * Replace PyQt4 with PySide throughout (e.g., in the imports) If using Python 2.6 replace {} in format strings with {0}, {1}, etc., as appropriate. Add [0] at the end of every QFileDialog.*() function call. (In PyQt these return a—possibly empty—filename; in PySide they return a filename–filter 2-tuple, but all the examples only need the filename.) Replace QT_VERSION_STR with qVersion(). Replace PYQT_VERSION_STR with PySide.__version__; you will also need to add import PySide in the imports after the future imports. Replace @pyqtSignature with @Slot. Replace def isAlive(qobj): ... with def isAlive(qobj): return True. (There is currently no PySide equivalent.) Replace chr with unichr.

The FOX toolkit is an open source, cross-platform widget toolkit, that is, a library of basic elements for building a graphical user interface (GUI). FOX stands for Free Objects for X.

FOX differentiates itself in the following way from other cross-platform toolkits: Tk is a cross-platform toolkit but does not have all of the widgets that FOX considers desirable. Qt had a different licensing model, which might have required a commercial license in some cases where FOX would not. (This is no longer the case starting with Qt 4.5.) wxWidgets promotes the use of native widgets on each supported platform. FLTK is a fast, low-footprint library that supports rapid application development, and requires less code to use, but lacks advanced widgets. All of these toolkits have some support for programming natively on Mac OS and/or Mac OS X platforms, which FOX currently does not support[

This is PyQt4 tutorial. The tutorial is suited for beginners and intermediate programmers. After reading this tutorial, you will be able to program non trivial PyQt4 applications.