> > Possibly reduce could be handled in a similar way with a fallback python
> > implementation? Otherwise your suggestion of conditionally adding it to __all__
> > makes sense to me.
> 
> In the meantime I'd expect the import of _functools.reduce to not be
> wrapped in a try block.  Does that have an impact on coverage?

I tried to remove the try block, but when making the import
unconditional the tests fail with an ImportError (because reduce doesn't
have a pure Python implementation). I haven't investigated further,
since the try block doesn't look like a real issue to me.