How to add rust code in the sub-module of python project?

[evan0greenup]

If I want to add my rust code to the sub-module (not the top level) of my python project, what should I do?

For example I the root module of my python project is hello. It contains three sub-module hello.alice, hello.bob, hello.carol. I want my rust code define the member attribute (fields and functions) of module hello.alice. And the other two sub-module is pure-python. What should I do?

[shenjackyuanjie]

English is not my native so sorry if there is some mistake

normal way

as you can see, pyo3 project have a __init__.py file
you can try use it to make your rust code a sub module of your python project
like this

- hello:
  - __init__.py
  - rust_code:
    - __init__.py
    - some.cp38-win_amd64.pyd
  - some_other.py

And remeber you need to copy your pyd/so build file in to rust_code dict
and remeber to write some usefull thing in your rust_code/__init__.py

from .some import *    # remeber to use releative import
from typing import TYPE_CHECKING
if TYPE_CHECKING:
  def this_is_rust(some_int: int) -> str: ...

Then you can use your rust code

from hello.rust_code import this_is_rust
this_is_rust(1123)

from hello import rust_code
rust_code.this_is_rust(1234)

tricky way

If you dont want to copy pyd/so in your project dir, you can use __init__.py to do import for you
like this

- hello:
  - rust_code:
    - __init__.py
  - some_other.py
- libs
  - __init__.py
  - some.cp38-win_amd64.pyd

hello/rust_code/__init__.py

from libs import *

libs/__init__.py

from .some import *    # remeber to use releative import

Then you can add these typing code to any of them

from typing import TYPE_CHECKING
if TYPE_CHECKING:
  def this_is_rust(some_int: int) -> str: ...

Then you can use your code just like normal way
(you can see some example in my project)