Python runs on top of interpreter, so no need to compile and learning curve is considered to be very low compared to C++. Python also enables using C libraries, and Qt bindings for Python do exist.

Nokia is not promoting well known PyQt bindings because of licensing issues, it's building its own bindings called PySide. My current knowledge is that latter is quite immature currently, so stick to PyQt. Licensing difference between these two is that PySide is LGPL, PyQt uses the heavy one.