Python compiled on Windows

[Franz Steinhaeusler]

Hello, I'm only curious.

Why is Python and most extension (also wxPython) not built using an
open source compiler like gcc or g++ on Windows?

I'm always wondering, why Microsoft is still supported 
in that way, using VC++ 7.1, if I'm not wrong.

Ok, maybe the compiled assembler code could be better, but
this cannot be the reason, or?

It would be wonderful (from the principle) if this could be possible.
>From the standpoint of open source.

What are your opinions?