How to build .so files in place using python setuptools and cythonize

Question

I have files in the following directory structure:

dir1
 | setup.py  
 | dir2
   | dir3
     | myFile.py
     | myOtherFile.py    

I want to build myFile.so and myOtherFile.so using cythonize and maintain this directory structure.

If I use this script:

# setup.py
from setuptools import Extension, setup
from Cython.Build import cythonize
import os

extensions=[Extension('dir2.dir3.*', ['dir2/dir3/*.py']]

setup(
    name="my_file",
    ext_modules=cythonize(extensions, language_level=3)
)

and run it with python setup.py build_ext --inplace, myFile.c and myOtherFile.c are built in dir2/dir3 next to the corresponding .py files, but myFile.so and myOtherFile.so are built in dir1, the parent directory that contains setup.py (actually, they appear to be copied there from the build dir as the last step of setup.py, which displays: >> running build_ext copying build/lib.linux-x86_64-3.7/myFile.cpython-37m-x86_64-linux-gnu.so -> just before the script exits).

If I use the command line version cythonize -i -3 dir2/dir3/*.py everything works as expected (i.e. the .so files appear in dir2/dir3). What do I need to add to my setup.py file to get the same behavior?

Note: unlike this toy example, I actually have a number of files in dir2/dir3, so I want to use the wild card *.py* to identify the .py files, rather than listing them individually.

question from:https://stackoverflow.com/questions/65853419/how-to-build-so-files-in-place-using-python-setuptools-and-cythonize

Answer 1

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