firefoxmetzger / mini-extension Goto Github PK

Hi @FirefoxMetzger , thanks for this example repo, I'm approaching building with poetry and it's very useful!

I'm focusing only on shared_library example, but probably those things I'm reporting can be found also on other examples.

Just some thing to improve:

1. on README.md example, due to the ctype function definition, the correct call is print(hello_world().decode()) because it returns c_char_p
2. to have hello_world.py a little more os-independent, the following implementation run in windows and in linux

import platform
import os
import re

from ctypes import cdll, c_char_p
from pathlib import Path

# load the library using ctypes
_extension = ''
if platform.system() == ' Windows':
    _extension = 'dll'
if platform.system() == 'Linux':
    _extension = 'so'

_base_path = Path(__file__).parent.absolute().joinpath('lib')
# linux do put 'lib' as name prefix and can put the version after the extension (e.g. libhello_library.so.0.1.0 )
res = [f for f in os.listdir(_base_path) if re.search(rf'[a-z]*hello_library[a_z]*.{_extension}[.0-9]*', f)]

# just one library should be into the folder, otherwise exception is raised
lib_shared_hello = cdll.LoadLibrary(str(_base_path.joinpath(res[0])))

# expose the hello function as hello_world in python
# Note: returns a bytes object, not a python string
hello_world = lib_shared_hello.hello
hello_world.restype = c_char_p

Thank you to have spotted the way to build C-project into poetry-managed project!

Hey there @FirefoxMetzger !

Thanks a lot for you example of how to compile c-extensions when working with poetry!

I managed to compile my C-extension locally. By locally I mean while working on the package itself.

Both poetry build and poetry install are compiling the objects to the desired place.

However when I try to use said package as a dependency to another package nothing gets compiled.

I tried with your shared_library_with_ctypes that I listed as one of my dependency in my pyproject..toml:

[tool.poetry.dependencies]
python = "3.10.*"
extension = { git = "[email protected]:FirefoxMetzger/mini-extension.git", subdirectory="shared_library_with_ctypes"}

After doing poetry install I get the error: FileNotFoundError for the extension/lib directory.

Am I missing something ? Any help would really be welcome!

Thanks!

This is the warning currently in place
https://github.com/pypa/setuptools/blob/v69.5.1/setuptools/dep_util.py#L5-L16.