old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import os
  import re
  import codecs
  
  from setuptools import setup, find_packages
  
  cwd = os.path.abspath(os.path.dirname(__file__))
  
  def read(filename):
      with codecs.open(os.path.join(cwd, filename), 'rb', 'utf-8') as h:
          return h.read()
  
  metadata = read(os.path.join(cwd, 'ronkyuu', '__init__.py'))
  
  def extract_metaitem(meta):
      # swiped from https://hynek.me 's attr package
      meta_match = re.search(r"""^__{meta}__\s+=\s+['\"]([^'\"]*)['\"]""".format(meta=meta),
                             metadata, re.MULTILINE)
      if meta_match:
          return meta_match.group(1)
      raise RuntimeError('Unable to find __{meta}__ string.'.format(meta=meta))
  
  if __name__ == '__main__':
      setup(
          name='ronkyuu',
          version=extract_metaitem('version'),
          description=extract_metaitem('description'),
          long_description=read('README.md'),
          author=extract_metaitem('author'),
          author_email=extract_metaitem('email'),
          maintainer=extract_metaitem('author'),
          maintainer_email=extract_metaitem('email'),
          url=extract_metaitem('url'),
          download_url=extract_metaitem('download_url'),
          license=extract_metaitem('license'),
          packages=find_packages(exclude=('tests', 'docs')),
          platforms=['Any'],
          install_requires=[
              'requests',
              'beautifulsoup4',
              'mf2py',
              'html5lib',
              'lxml',
          ],
          classifiers=[
              'Development Status :: 4 - Beta',
              'Intended Audience :: Developers',
              'Operating System :: OS Independent',
              'License :: OSI Approved :: MIT License',
              'Programming Language :: Python',
              'Programming Language :: Python :: 2',
              'Programming Language :: Python :: 2.7',
              'Programming Language :: Python :: 3',
              'Programming Language :: Python :: 3.3',
              'Programming Language :: Python :: 3.4',
              'Programming Language :: Python :: 3.5',
              'Topic :: Software Development :: Libraries :: Python Modules',
          ]
      )
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import os
  import re
  import codecs
  
  from setuptools import setup, find_packages
  
  cwd = os.path.abspath(os.path.dirname(__file__))
  
  def read(filename):
      with codecs.open(os.path.join(cwd, filename), 'rb', 'utf-8') as h:
          return h.read()
  
  metadata = read(os.path.join(cwd, 'ronkyuu', '__init__.py'))
  
  def extract_metaitem(meta):
      # swiped from https://hynek.me 's attr package
      meta_match = re.search(r"""^__{meta}__\s+=\s+['\"]([^'\"]*)['\"]""".format(meta=meta),
                             metadata, re.MULTILINE)
      if meta_match:
          return meta_match.group(1)
      raise RuntimeError('Unable to find __{meta}__ string.'.format(meta=meta))
  
  if __name__ == '__main__':
      setup(
          name='ronkyuu',
          version=extract_metaitem('version'),
          description=extract_metaitem('description'),
          long_description=read('README.md'),
          author=extract_metaitem('author'),
          author_email=extract_metaitem('email'),
          maintainer=extract_metaitem('author'),
          maintainer_email=extract_metaitem('email'),
          url=extract_metaitem('url'),
          download_url=extract_metaitem('download_url'),
          license=extract_metaitem('license'),
          packages=find_packages(exclude=('tests', 'docs')),
          platforms=['Any'],
          use_2to3=True,
          install_requires=[
              'requests',
              'beautifulsoup4',
              'mf2py',
              'html5lib',
              'lxml',
          ],
          classifiers=[
              'Development Status :: 4 - Beta',
              'Intended Audience :: Developers',
              'Operating System :: OS Independent',
              'License :: OSI Approved :: MIT License',
              'Programming Language :: Python',
              'Programming Language :: Python :: 2',
              'Programming Language :: Python :: 2.7',
              'Programming Language :: Python :: 3',
              'Programming Language :: Python :: 3.3',
              'Programming Language :: Python :: 3.4',
              'Programming Language :: Python :: 3.5',
              'Topic :: Software Development :: Libraries :: Python Modules',
          ]
      )
  
subject: add use_2to3=True to setup.py