wxPython

Designed to be a valid alternative for Tkinter, the de-facto graphical user interface toolkit included within Python, wxPython is a powerful and robust cross-platform GUI library that allows Python aficionados to create apps with functional and reliable graphical user interfaces.

For example, an application built with wxPython which runs on Windows should look and feel just like any other Windows-specific app.

One of the chief advantages of using a toolkit such as wxPython is that users can develop native interfaces for their Python projects, and run them with little to no modifications on some of the most popular OSes out there such as Windows, macOS, and Linux, as well as other UNIX-based ones, provided they bundle GTK2 and GTK3 libraries.

This particular toolkit uses a set of Python modules to build the user interface components of the C++-built wxWidgets cross-platform library.

For more detailed information regarding wxPython, its APIs, sections, and modules, users can check out the bulky documentation section on the library's official website.

Users can also take a look at the very useful Getting Started guides and even have a go at a fully functional demo by visiting the app's adjacent Wiki webpage