Message 76626 - Python tracker

So the obvious quick fix is, on OS X only, to set the locale to e.g. 
"en_US.UTF-8" instead of "" just before the mbstowcs call.

Here's a patch that does this.

I don't like this much, though.  For one thing, I don't have any reason 
to believe that the particular locale "en_US.UTF-8" will be supported on 
any given installation of OS X.

Anyone have any better suggestions?