You could always add a Python/PySide module/plugin for QtCreator. It has pretty solid (though slightly underdocumented, sadly) plugin support and you can do fantastic things with it. It's also an open source project, so nothing stopping third parties like yourself from adding missing features.
Having said that, if Digia were to officially support Python/PySide in QtCreator/QtSDK, that would be really really awesome.
Re:Nokia sells Qt to Digia
by Wibblesworth on Thursday August 09, 2012 @11:29AM
(#4361500)
I wrote a Qt Creator plugin a while ago that does code completion, tooltips, navigation, etc. for Python source code. I never did anything specifically for PySide but it might be fun to try: https://github.com/davidsansome/pyqtc
Power of QT + Productivity of QT Creator + Simplicity of Python = Amazing, IMHO.
PySide-powered python scripts can be frozen into binaries with various tools such as cxFreeze, that's a good thing.
BTW, QT Creator is one of my inspiration sources for my new text editor with a Firebug-like UI for testing css/html in real-time (http://liveditor.com).