setup.py

#!/usr/bin/python3

import os
import sys

from setuptools import setup, Extension

if sys.version_info[0] == 2:
    raise Exception('Python 2.x is no longer supported')

setup_dict = dict(
    packages=[ 'cobs', 'cobs.cobs', 'cobs.cobsr', 'cobs._version', ],
    package_dir={
        'cobs' : 'src/cobs',
    },
)

if not hasattr(sys, "pypy_version_info") and os.environ.get("COBS_PUREPYTHON"):
    setup_dict['ext_modules'] = [
                                    Extension('cobs.cobs._cobs_ext',    [ 'src/ext/_cobs_ext.c',  ]),
                                    Extension('cobs.cobsr._cobsr_ext',  [ 'src/ext/_cobsr_ext.c', ])
                                ]

try:
    setup(**setup_dict)
except KeyboardInterrupt:
    raise
except:
    del setup_dict['ext_modules']
    setup(**setup_dict)