I'm not defending other languages, I'm recommending them. I'm also recommending D when its appropriate. But nobody is forced to use just one programming language. I use at least half a dozen languages throughout my average week; C, C++, Python, Delphi (rarely), D, AHK, batch (hehe, ok that one doesn't count :p), some ASM which I'm just playing around with for now, and probably other languages.
Gour doesn't have to quit D, he can use some time-out for a while and see what Python has to offer. In the meantime the D ecosystem will likely grow. Now, these arguments aside, onto the technical side of things. You could build a GUI in Python and then link to D via callback functions. It shouldn't be a problem with either Python's ctypes or Cython, whichever might be easier to use. Python+Qt has been stable for a long while now, so it's really not a bad choice as a GUI language. And it has good documentation and books to learn from, and plenty of example code too. I'm not sure what that would do to performance (linking Python with D), but then again I don't know what type of desktop app Gour is building. On the other hand, I've seen Python being used in a realtime app that is linked with C++. For example Ableton Live (a fairly popular music sequencer) uses the Boost C++ Python binding for a big part of their application. They use it to interface with various MIDI and sequencing hardware, and various hardware manufacturers develop their own Ableton-specific Python scripts that add support to their special hardware so it works nicely in Ableton Live. I believe they might also be using Python to run their GUI, but I can't be sure since I've only heard that offhand from some people commenting about it. Now, there's a Python binding project for D1, PyD, with exception support and various other nice things. I don't know whether anyone will work on a D2 version. But from looking at its source it doesn't look *too* complicated. In fact there's a good part of that code seems to be implementation of common functions which were missing in D1 Phobos, but are here in Phobos2. So maybe it wouldn't be too hard to port that to D2 some day. But I don't know the details.
