Hello devs,
I'm developing the setup.py for a scientific package, MDAnalysis
<https://github.com/MDAnalysis/mdanalysis/> (see PR #799
<https://github.com/MDAnalysis/mdanalysis/pull/799>). We depend on
distutils and setuptool. Namely, we use setuptools.extension.Extension
class for our extensions.
Some older versions of setuptools (<18.0) do filename cythonization
themselves upon initialization of the Extension object.
Because we want to control name cythonization ourselves I try to directly
use distutils.extension.Extension, which has none of setuptools'
cythonization. However, this doesn't work because setuptools patches
distutils, so that distutils.extension.Extension effectively becomes
setuptools.extension.Extension.
setuptools does provide a copy of the unpatched Extension class, via
setuptools.extension._Extension. Yet, if I attempt to pass instances of
this class to Cython.cythonize it fails because my extension parent no
longer conforms to one of the expected classes:
File "./setup.py", line 283, in cythonize
new_ext_modules = Cython.cythonize(self.ext_modules)
File
"/scratch/virtualenv/lib/python2.7/site-packages/Cython-0.24-py2.7-linux-x86_64.egg/Cython/Build/Dependencies.py",
line 796, in cythonize
aliases=aliases)
File
"/scratch/virtualenv/lib/python2.7/site-packages/Cython-0.24-py2.7-linux-x86_64.egg/Cython/Build/Dependencies.py",
line 686, in create_extension_list
raise TypeError(msg)
TypeError: pattern is not of type str nor subclass of Extension (<class
setuptools.extension.Extension at 0x7f66be4e2a78>) but of type <type
'instance'> and class distutils.extension.Extension
I believe cythonize should be more permissive with the extension parent
classes it accepts, or at least have the setuptools _Extension one in the
whitelist, since it's the only way to access the original distutils class.
What do you think?
In the meantime I'll solve this by subclassing
setuptools.extension.Extension and making sure it doesn't cythonize
anything.
Cheers,
Manuel
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