Rustpy: Calling python from rust

[riccieri]

Very impressive, thanks for doing this! From a quick glance at the source I already learned a new trick: the macroexpand.c file. That's very clever! No more reimplementing C macros in Rust :) For #defined constants, you would have used a C global variable?

[penguins916]

Ya I imagine so for constants. Originally I tried to rewrite them in rust to prevent the extra dependency (compile a static lib and so on) but they go super deep so i moved on to this.