old_contents: from __future__ import absolute_import
  from setuptools import setup, find_packages
  from setuptools.command.install import install
  
  
  class InstallCommand(install):
      user_options = install.user_options + [
          ('no-ml', None, "Don't install without Machine Learning modules."),
      ]
  
      boolean_options = install.boolean_options + ['no-ml']
  
      def initialize_options(self):
          install.initialize_options(self)
          self.no_ml = None
  
      def finalize_options(self):
          install.finalize_options(self)
          if self.no_ml:
              dist = self.distribution
              dist.packages=find_packages(exclude=[
                  'tests',
                  'tests.*',
                  'talon.signature',
                  'talon.signature.*',
              ])
              for not_required in ['numpy', 'scipy', 'scikit-learn==0.16.1']:
                  dist.install_requires.remove(not_required)
  
  
  setup(name='talon',
        version='1.2.10',
        description=("Mailgun library "
                     "to extract message quotations and signatures."),
        long_description=open("README.rst").read(),
        author='Mailgun Inc.',
        author_email='admin@mailgunhq.com',
        url='https://github.com/mailgun/talon',
        license='APACHE2',
        cmdclass={
            'install': InstallCommand,
        },
        packages=find_packages(exclude=['tests', 'tests.*']),
        include_package_data=True,
        zip_safe=True,
        install_requires=[
            "lxml>=2.3.3",
            "regex>=1",
            "numpy",
            "scipy",
            "scikit-learn==0.16.1", # pickled versions of classifier, else rebuild
            'chardet>=1.0.1',
            'cchardet>=0.3.5',
            'cssselect'
            ],
        tests_require=[
            "mock",
            "nose>=1.2.1",
            "coverage"
            ]
        )
  
new_contents: from __future__ import absolute_import
  from setuptools import setup, find_packages
  from setuptools.command.install import install
  
  
  class InstallCommand(install):
      user_options = install.user_options + [
          ('no-ml', None, "Don't install without Machine Learning modules."),
      ]
  
      boolean_options = install.boolean_options + ['no-ml']
  
      def initialize_options(self):
          install.initialize_options(self)
          self.no_ml = None
  
      def finalize_options(self):
          install.finalize_options(self)
          if self.no_ml:
              dist = self.distribution
              dist.packages=find_packages(exclude=[
                  'tests',
                  'tests.*',
                  'talon.signature',
                  'talon.signature.*',
              ])
              for not_required in ['numpy', 'scipy', 'scikit-learn==0.16.1']:
                  dist.install_requires.remove(not_required)
  
  
  setup(name='talon',
        version='1.2.10',
        description=("Mailgun library "
                     "to extract message quotations and signatures."),
        long_description=open("README.rst").read(),
        author='Mailgun Inc.',
        author_email='admin@mailgunhq.com',
        url='https://github.com/mailgun/talon',
        license='APACHE2',
        cmdclass={
            'install': InstallCommand,
        },
        packages=find_packages(exclude=['tests', 'tests.*']),
        include_package_data=True,
        zip_safe=True,
        install_requires=[
            "lxml>=2.3.3",
            "regex>=1",
            "numpy",
            "scipy",
            "scikit-learn==0.16.1", # pickled versions of classifier, else rebuild
            'chardet>=1.0.1',
            'cchardet>=0.3.5',
            'cssselect',
            'six>=1.10.0',
            ],
        tests_require=[
            "mock",
            "nose>=1.2.1",
            "coverage"
            ]
        )
  
subject: Add six library to setup.py