old_contents: from distutils.core import setup, Extension
  
  module1 = Extension('bitset',
                      sources = ['bitsetmodule.c'])
  
  setup (name = 'PackageName',
         version = '1.0',
         description = 'This is a demo package',
         ext_modules = [module1])
  
  
new_contents: from distutils.core import setup, Extension
  
  bitset_extmodule = Extension('bitset',
                               sources=['bitsetmodule.c'])
  
  setup(name='bitset',
        version='0.1',
        description='Bitset module.',
        ext_modules=[bitset_extmodule],
        author="Pete Hollobon",
        author_email="python@hollobon.com",
        url="http://github.com/hollobon/pybitset",
        licence="MIT"
        )
  
  
subject: add more details to setup.py