exec_module() missing 1 required positional argument: 'module'

[radarhere]

Hi. Over at python-pillow/Pillow#4769, we've started receiving an error in Python 3.9 -

TypeError: exec_module() missing 1 required positional argument: 'module'

I find that our code passes with setuptools 47.3.1, but fails with 47.3.2. Investigating, I find that https://github.com/pypa/setuptools/pull/2071/files adds ExtensionFileLoader(__name__,__file__).exec_module() - calling exec_module without any arguments.

Looking at https://docs.python.org/3/library/importlib.html#importlib.machinery.ExtensionFileLoader, I would conclude that yes, exec_module does require an argument.

I'm hoping that seems like a suitably obvious bug in setuptools. Let me know if it's not.

[jaraco]

@alexhenrie Can you investigate and devise a fix?

[alexhenrie]

Shoot, you have my apologies. I have opened pull request #2249 which I believe will get everything working again.

[danielgordon10]

Can you please push a patch to PYPI? Many projects that don't pin the version are starting to get the bug.

[jaraco]

The fix was released in 49.1.3 and 49.2.0, both in PyPI since Jul 12.

Are projects not pinning Setuptools getting those slighly older than latest versions?

[danielgordon10]

https://github.com/numpy/numpy/pull/16870/files#diff-522adf759addbd3b193c74ca85243f7d For example NumPY doesn't trust 49.2.0