Since Python is not as firmly bolted down to Unix as either Perl
or Tcl/Tk, there has been more interest in (OS) portable systems. 
stdwin is a portable window system from cwi.nl ( the same place
Python originated ). However, stdwin doesn't look "native" on 
any of it's platforms, and has a few other limitation that have
put off it's wide use. ( But there is Python support for it. ) 
SUIT ( Simple User Interface Toolkit ) is a package from UVA 
( uvacs.cs.virginia.edu:/pub/suit ) that provides a portable 
GUI builder and API for Unix-X11,Macintosh,DOS,MS-Windows and
other platforms. There are a set of Python modules ( .py and .c 
code ) to interface SUIT to Python. 
( There are precompiled SUIT demo's available - take a look! )
There are Python Xt/Xlib/Motif modules, but there needs to be
more work done on integrating them into easier to use Python
classes. ( There is also an interface to SGI's GL, which I 
have gotten to work on an IBM RS/6000 with GL with some minor
hacks. )
There is also a commercial GUI builder, called EzX, that includes 
a Python interpreter built into the package. 
There has been discussion on the Python mailing list of integrating
Tk and/or other GUI toolkits into Python. I don't know if anyone
is currently working on it. 
- Steve Majewski       (804-982-0831)      <sdm7g@Virginia.EDU>
- UVA Department of Molecular Physiology and Biological Physics