def get_ext_filename(self, ext_name):
        r"""Convert the name of an extension (eg. "foo.bar") into the name
        of the file from which it will be loaded (eg. "foo/bar.so", or
        "foo\bar.pyd").
        """
        from ..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
Convert the name of an extension (eg. "foo.bar") into the name
        of the file from which it will be loaded (eg. "foo/bar.so", or
        "foo\bar.pyd").
        
product/gradle-plugin/src/main/python/setuptools/_distutils/command/build_ext.py