const or #define coming from C

[jefsummers]

Right. It is not trivial, but there is a mechanism. Start by reading PEP 1. This explains what PEPs are, and part way down you get the section "Start with an idea for Python". There are then guides for submission. It does require a GitHub account and the process creates a fork, so you should familiarize yourself with that if you aren't already.

Then it may be a good idea to look at some PEP submissions. Linking to one that Guido submitted and self rejected! Yet I hear something similar is coming in a version soon. https://www.python.org/dev/peps/pep-3103/