This package will not be ported to Python 3. We can do without it – see
if there is an alternative listed in the notes.
If you think it would be good to port it anyway, get in touch with the upstream!
The last Pyrex release was in 2010.
Cython, originally a Pyrex fork, is now a mature and widely used tool.
It does introduce some incompatible extensions, however.
Suggested replacement: Cython