old_contents: from setuptools import setup
  
  setup(
      name='pymessenger',
      packages=['pymessenger'],
      version='1.0.0',
      install_requires=[
          'requests',
          'requests-toolbelt',
          'six'
      ],
      description="Python Wrapper for Facebook Messenger Platform",
      author='David Chua',
      author_email='zhchua@gmail.com',
      url='https://github.com/davidchua/pymessenger',
      download_url='https://github.com/davidchua/pymessenger/tarball/1.0.0',
      keywords=['facebook messenger', 'python', 'wrapper', 'bot', 'messenger bot'],
      classifiers=[],
  )
  
new_contents: from setuptools import setup
  
  installation_requirements = [
      'requests',
      'requests-toolbelt',
      'six'
  ]
  
  try:
      import enum
      del enum
  except ImportError:
      installation_requirements.append('enum')
  
  setup(
      name='pymessenger',
      packages=['pymessenger'],
      version='1.0.0',
      install_requires=installation_requirements,
      description="Python Wrapper for Facebook Messenger Platform",
      author='David Chua',
      author_email='zhchua@gmail.com',
      url='https://github.com/davidchua/pymessenger',
      download_url='https://github.com/davidchua/pymessenger/tarball/1.0.0',
      keywords=['facebook messenger', 'python', 'wrapper', 'bot', 'messenger bot'],
      classifiers=[],
  )
  
subject: check if enum installed and add to installation_requirements if not. This is a fix for Python 2 installations