Mr. Yetti Mr. Yetti - 1 year ago 94
Python Question

Change Cython's naming rules for .so files

I'm using Cython to generate a shared object out of Python module. The compilation output is written to

. Is there any option to change the naming rule? I want the file to be named
without the interpreter version or arch appendix.

Answer Source

Seems like setuptools provides no option to change or get rid of the suffix completely. The magic happens in distutils/command/

def get_ext_filename(self, ext_name):
    from distutils.sysconfig import get_config_var
    ext_path = ext_name.split('.')
    ext_suffix = get_config_var('EXT_SUFFIX')
    return os.path.join(*ext_path) + ext_suffix

Seems like I will need to add a post-build renaming action.

Update from 08/12/2016:

Ok, I forgot to actually post the solution. Actually, I implemented a renaming action by overloading the built-in install_lib command. Here's the logic:

from distutils.command.install_lib import install_lib as _install_lib

def batch_rename(src, dst, src_dir_fd=None, dst_dir_fd=None):
    '''Same as os.rename, but returns the renaming result.'''
    os.rename(src, dst,
    return dst

class _CommandInstallCythonized(_install_lib):
    def __init__(self, *args, **kwargs):
        _install_lib.__init__(self, *args, **kwargs)

    def install(self):
        # let the distutils' install_lib do the hard work
        outfiles = _install_lib.install(self)
        # batch rename the outfiles:
        # for each file, match string between
        # second last and last dot and trim it
        matcher = re.compile('\.([^.]+)\.so$')
        return [batch_rename(file, re.sub(matcher, '.so', file))
                for file in outfiles]

Now all you have to do is to overload the command in the setup function:

        'install_lib': _CommandInstallCythonized,

Still, I'm not happy with overloading standard commands; if you find a better solution, post it and I will accept your answer.

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