python - AttributeError: 拡張インスタンスに属性 '__version__' がありません

Question

これがスクリプトです..

from distutils.core import setup, Extension

nmap = Extension('nmap',sources = ['nmap/nmap.py', 
                           'nmap/__init__.py', 'nmap/example.py'])

from nmap import *

setup (
    name = 'python-nmap',
    version = nmap.__version__,
    author = 'Alexandre Norman',
    author_email = 'norman@xael.org',
    license ='gpl-3.0.txt',
    keywords="nmap, portscanner, network, sysadmin",)

...そして、私はこのエラーを受け取りました:

Traceback (most recent call last):
  File "C:\Python27\nmap.py", line 6, in <module>
    from nmap import *
  File "C:\Python27\nmap.py", line 17, in <module>
    version = nmap.__version__,
AttributeError: Extension instance has no attribute '__version__'