PyQt is the Python bindings for Digia's Qt cross-platform application development framework. It supports Python v2 and v3 and Qt v4 and Qt v5. PyQt is available under the GPL and commercial licenses. The Sourceforge project is the repository for the GPL source and binary packages.
I would like to see Qt Creator form part of the PyQt and PySide download as I regularly use creator when writing GUIs. Still, both are excellent to use.