old_contents: from setuptools import find_packages, setup
  
  setup(
      name="clipspy",
      version="0.0.1",
      author="Matteo Cafasso",
      author_email="noxdafox@gmail.com",
      description=("CLIPS Python bindings."),
      packages=find_packages(),
      ext_package="clips",
      setup_requires=["cffi>=1.0.0"],
      install_requires=["cffi>=1.0.0", "enum34"],
      cffi_modules=["clips_build.py:ffibuilder"],
      classifiers=[
          "Programming Language :: Python",
          "Programming Language :: Python :: 2",
          "Programming Language :: Python :: 3",
          "Development Status :: 5 - Production/Stable",
          "Intended Audience :: Developers",
          "License :: OSI Approved :: BSD License"
      ]
  )
  
new_contents: from setuptools import find_packages, setup
  
  setup(
      name="clipspy",
      version="0.0.1",
      author="Matteo Cafasso",
      author_email="noxdafox@gmail.com",
      description=("CLIPS Python bindings."),
      packages=find_packages(),
      ext_package="clips",
      setup_requires=["cffi>=1.0.0"],
      install_requires=["cffi>=1.0.0"],
      extras_require={":python_version<'3'": ["enum34"]},
      cffi_modules=["clips_build.py:ffibuilder"],
      classifiers=[
          "Programming Language :: Python",
          "Programming Language :: Python :: 2",
          "Programming Language :: Python :: 3",
          "Development Status :: 5 - Production/Stable",
          "Intended Audience :: Developers",
          "License :: OSI Approved :: BSD License"
      ]
  )
  
subject: make Python 2 dependencies optional