old_contents: #!/usr/bin/env python
  
  from setuptools import setup
  import argparse_addons
  
  setup(name='argparse_addons',
        version=argparse_addons.__version__,
        description=('Additional argparse types and actions.'),
        long_description=open('README.rst', 'r').read(),
        author='Erik Moqvist',
        author_email='erik.moqvist@gmail.com',
        license='MIT',
        classifiers=[
            'License :: OSI Approved :: MIT License',
            'Programming Language :: Python :: 3',
            'Programming Language :: Python :: 3.6',
            'Programming Language :: Python :: 3.7',
            'Programming Language :: Python :: 3.8',
            'Programming Language :: Python :: 3.9',
        ],
        keywords=['argparse'],
        url='https://github.com/eerimoq/argparse_addons',
        py_modules=['argparse_addons'],
        python_requires='>=3.6',
        install_requires=[
        ],
        test_suite="tests")
  
new_contents: #!/usr/bin/env python
  
  from setuptools import setup
  import argparse_addons
  
  setup(name='argparse_addons',
        version=argparse_addons.__version__,
        description=('Additional argparse types and actions.'),
        long_description=open('README.rst', 'r').read(),
        author='Erik Moqvist',
        author_email='erik.moqvist@gmail.com',
        license='MIT',
        classifiers=[
            'License :: OSI Approved :: MIT License',
            'Programming Language :: Python :: 3',
            'Programming Language :: Python :: 3 :: Only',
            'Programming Language :: Python :: 3.6',
            'Programming Language :: Python :: 3.7',
            'Programming Language :: Python :: 3.8',
            'Programming Language :: Python :: 3.9',
        ],
        keywords=['argparse'],
        url='https://github.com/eerimoq/argparse_addons',
        py_modules=['argparse_addons'],
        python_requires='>=3.6',
        install_requires=[
        ],
        test_suite="tests")
  
subject: add py3 only classifier