old_contents: from setuptools import setup, find_packages
  
  version = {}
  with open("./binarytree/version.py") as fp:
      exec(fp.read(), version)
  
  with open('./README.rst') as fp:
      description = fp.read()
  
  setup(
      name='binarytree',
      description='Python Library for Studying Binary Trees',
      long_description=description,
      version=version['__version__'],
      author='Joohwan Oh',
      author_email='joohwan.oh@outlook.com',
      url='https://github.com/joowani/binarytree',
      packages=find_packages(exclude=['tests']),
      include_package_data=True,
      tests_require=['pytest', 'flake8'],
      license='MIT',
      classifiers=[
          'Intended Audience :: Developers',
          'Intended Audience :: End Users/Desktop',
          'Intended Audience :: Information Technology',
          'License :: OSI Approved :: MIT License',
          'Operating System :: POSIX',
          'Operating System :: MacOS',
          'Operating System :: Unix',
          'Operating System :: Microsoft :: Windows',
          'Programming Language :: Python',
          'Programming Language :: Python :: 2',
          'Programming Language :: Python :: 3',
          'Topic :: Education'
      ]
  )
  
new_contents: from setuptools import setup, find_packages
  
  version = {}
  with open("./binarytree/version.py") as fp:
      exec(fp.read(), version)
  
  with open('./README.rst') as fp:
      description = fp.read()
  
  setup(
      name='binarytree',
      description='Python Library for Studying Binary Trees',
      long_description=description,
      version=version['__version__'],
      author='Joohwan Oh',
      author_email='joohwan.oh@outlook.com',
      url='https://github.com/joowani/binarytree',
      packages=find_packages(exclude=['tests']),
      include_package_data=True,
      tests_require=['pytest', 'flake8'],
      license='MIT',
      classifiers=[
          'Intended Audience :: Developers',
          'Intended Audience :: Information Technology',
          'License :: OSI Approved :: MIT License',
          'Operating System :: POSIX',
          'Operating System :: MacOS',
          'Operating System :: Unix',
          'Operating System :: Microsoft :: Windows',
          'Programming Language :: Python',
          'Programming Language :: Python :: 2',
          'Programming Language :: Python :: 3',
          'Topic :: Education'
      ]
  )
  
subject: Remove a setup.py classifier