Hi Anis,
I think there are two libraries that you didn't mention here, which
are Tkinter and WxPython.
If you want to build a simple GUI and avoid overheads if you're
beginner use Tkinter it is python built-in,
and easy to learn and to deal with.
if you're more comfortable with python, with a Linux background use
PyGTK, coz you can find plenty of code source examples,
starting from you're OS if you're using ubuntu.
if you want to use GUI builder I used one called Boa Constrictor back
at the time.
if you want more details follow this link you'll find more opinions:
http://stackoverflow.com/questions/3993269/pygtk-vs-pyqt-vs-wxpython-vs-tkinter