How can I use Crystal in Python packages/extensions?

Question

Is it possible to use Crystal in Python3 packages/extensions?

Answer 1

dl has been deprecated in python3, look at ctypes.

It might be possible as highlighted here: https://github.com/hyronx/crystal-shared-lib

What this might look like in python3:

from ctypes import *

cdll.LoadLibrary("libcrystal-shared-lib.so")

crystal = CDLL("libcrystal-shared-lib.so") 

crystal.test(None) 

note

I am not sure at the moment how the primitives convert from Python's None to C's None to Crystal's Nil, but nil returns a 0_u64, so it's a hint, of some sort.

• https://docs.python.org/3/library/ctypes.html#fundamental-data-types
• https://github.com/crystal-lang/crystal/blob/391785249f66aaf5929b787b29810aeb4af0e1e8/src/nil.cr#L42

related posts:

• https://github.com/crystal-lang/crystal/issues/921
• https://github.com/hyronx/crystal-shared-lib
• https://docs.python.org/3.7/library/ctypes.html#module-ctypes