Honestly, I think it's really absurd that you tell me what to invest time in.
Furthermore, KDevelop as a project and my involvement in it largely precedes QtCreator. Awkward...
These trolls seem to be everywhere these days, most of them users but almost never contributers of FOSS projects themselves.
Somehow they always end up seeing themselves above a stream of development power which,
as they don't contribute to it themselves, they feel the responsibility to guide in the most wise way (ie. "THIS AINT WANT LINUX NEEDS TO SUCCEED!!1").
Proper python autocompletion + pyqt seems to be on the todo list of qtcreator forever and kdevelop seems to be not as fast with it either, but at least it seems to be active: http://quickgit.kde.org/?p=kdev-python.git&a=summary
As a beginner it would be so much easier to get into when you wouldn't need to look at the documentation all the time how every signal is named, etc... All the "python ides" are very strange to me, even eric5 doesn't seem to autocomplete signals... Sadly pydev in eclipse seems to be still the python ide that gives the best out of the box experience. :/
KDevelop is my IDE of choice on Linux for C++ programming when I want the IDE experience (for editing a self contained piece of code I prefer vim). Excellent work. Now if I could integrate valgrind and gdb with an interface as powerful as ddd and as usable as KDevelop - one can dream.