How to tell if you're running on windows?

[David Robinow]

On Fri, Dec 4, 2009 at 1:46 PM, Roy Smith <roy at panix.com> wrote:
> I'm using 2.5.1.  How can I tell if I'm running on windows?  The
> obvious answer, platform.system(), gets complicated.  On the python
> that comes with cygwin, it returns 'CYGWIN_NT-5.2-WOW64', but I've got
> a native windows build of python where it returns 'Microsoft'.
>
> The real problem I'm trying to solve is whether to build a LIBPATH
> environment variable with ';' or ':' delimiting the entries.  On the
> cygwin build, os.pathsep returns ':', which isn't really correct.  If
> you use that, you end up building paths that look like c:foo:c:bar.
> It should be c:foo;c:bar

It's not clear to me what you're using LIBPATH for.
Are you running a cygwin executable from Python? Or a Windows
executable from cygwin?
LIBPATH should be in the format desired by the consumer.