PyQt v4.5.1 Released (Python bindings for Qt)

Phil Thompson phil at
Tue Jun 16 09:09:33 EDT 2009

PyQt v4.5.1 has been released and is available from

PyQt is a comprehensive set of bindings for the Qt application and UI
framework from Nokia.  It supports the same platforms as Qt (Windows,
Linux and MacOS/X).

The highlights of this release include:

- support for Python v3

- support for Qt v4.5

- a new Pythonic API for connecting signals and slots that doesn't
  require any knowledge of C++ data types

- support for the GTK+ theme engine.

Windows installers are provided for the GPL version of PyQt which contains
everything needed for PyQt development (including Qt, Qt Designer and
QScintilla) except Python itself.

PyQt v4 is implemented as a set of 18 extension modules containing over
400 classes and over 6,000 functions and methods.

    The non-GUI infrastructure including event loops, threads, i18n,
    Unicode, signals and slots, user and application settings, mapped
    files and shared memory.

    A set of classes that allow the Qt Designer GUI design tool to be
    extended with PyQt.

    A rich collection of GUI widgets.

    A set of classes for creating and viewing searchable documentation and
    being able to integrate online help with PyQt applications.  It
    includes the C++ port of the Lucene text search engine.

    A set of classes to support TCP and UDP socket programming and higher
    level protocols (eg. HTTP, SSL).

    A set of classes that allows PyOpenGL to render onto Qt widgets.

    A set of classes that implements a JavaScript interpreter.  Python
    objects may be exposed in the interpreter as JavaScript objects.

    A debugger for the JavaScript interpreter.

    A set of classes that implement SQL data models and interfaces to
    industry standard databases.  The Windows installers include support
    for SQLite, MySQL, PostgreSQL and ODBC.

    A set of classes to render SVG files onto Qt widgets.

    A set of classes to automate unit testing of PyQt applications and

    This implements a web browser engine based on the WebKit engine used by
    Apple's Safari browser.  It allows the methods and properties of Python
    objects to be published and appear as JavaScript objects to scripts
    embedded in HTML pages.

    A set of classes that implement DOM and SAX parsers.

    A set of classes that implement XQuery and XPath support for XML and
    custom data models.

    A set of classes that enables the Qt Assistant online help browser to
    be integrated with an application.

    A set of classes for Windows that allows the integration of ActiveX
    controls and COM objects.

    A cross-platform multimedia framework that enables the use of audio and
    video content in PyQt applications.  DirectX is used as the Windows
    backend, QuickTime as the MacOS/X backend, and GStreamer as the Linux

    PyQt includes dbus.mainloop.qt that allows the Qt event loop to be used
    with the standard DBus Python bindings.

PyQt includes the pyuic4 utility which generates Python code to implement
user interfaces created with Qt Designer in the same way that the uic
utility generates C++ code.  It is also able to load Designer XML files

PyQt is available under the GPL and a commercial license.  Unlike Qt, PyQt
is not available under the LGPL.  The commercial PyQt license allows GPL
applications to be relicensed at any time.

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