build_ext.py 文件源码

def _get_config_var_837(name):
    """
    In https://github.com/pypa/setuptools/pull/837, we discovered
    Python 3.3.0 exposes the extension suffix under the name 'SO'.
    """
    if sys.version_info < (3, 3, 1):
        name = 'SO'
    return get_config_var(name)