I have a Cython extension module for a Python project I want to install to the same namespace as the project on installation. When I try to specify in the extension to install it inside the package itself, it can't be found and imported. If I specify the extension goes in the root of the Python namespace, it works fine, but it's not in the module namespace I want. How do I get the Extension Module to be importable from the same namespace as the package itself?
I've made a simple test case for this question.
Folder Structure:
mypkg
├── foo
│ ├── __init__.py
│ └── barCy.pyx
└── setup.py
The .barCy.pyx file:
cpdef long bar():
return 0
The setup.py code:
import distutils.extension
from Cython.Build import cythonize
from setuptools import setup, find_packages
extensions = [distutils.extension.Extension("foo.bar",
['foo/barCy.pyx'])]
setup(
name='foo',
packages=find_packages(),
ext_modules=cythonize(extensions),
)
The __init.py__ is empty.
I want to be able to do:
>>> import foo.bar as bar
>>> bar.bar()
0
Instead, I get
>>> import foo.bar as bar
ModuleNotFoundError: No module named 'foo.bar'
If I were to change the Extension("foo.bar",... to Extension("bar",..., then I can do import bar like it were a top level package. Although that is the expected behavior, it's not what I want as I only want this extension module to be accessible through the foo namespace.