PyQt4

PyQt4 is a set of Python bindings for the Qt application framework. Developed by Riverbank Computing, it allows Python programmers to use the powerful Qt library for creating graphical user interfaces (GUIs) and other cross-platform applications. PyQt4 provides access to a vast array of Qt's classes and functions, covering everything from widgets and dialogs to networking, database access, and multimedia.

The primary advantage of PyQt4 is its ability to leverage Python's ease of use and rapid development capabilities with Qt's mature and feature-rich C++ framework. This combination enables developers to build sophisticated desktop applications efficiently. PyQt4 supports multiple operating systems, including Windows, macOS, and Linux, ensuring that applications developed with it can run on various platforms without significant modification.

PyQt4's licensing is dual, offered under the GPL and a commercial license. This means applications distributed under the GPL must also be open-source, while commercial use typically requires purchasing a license. While PyQt4 was widely used, its successor, PyQt5, has largely superseded it, offering newer Qt features and ongoing development. PyQt4 is still functional and supported for existing projects but is generally not recommended for new development.