> As far as fixing this for 2.7 goes, i don't like the _sound_ of it
> because it is gross... But i'm actually okay with having special case
> code in the gzip module that rejects '<fdopen>' as an actual filename
> and uses '' instead in that case.  It is VERY unlikely that anyone ever
> intentionally wants to use that as a filename.

I agree - it sounds ugly, but pragmatically it seems like the best option.
Given that the output will still be a valid gzip file even in this rare
case, it seems unlikely to cause trouble even then.