old_contents: #!/usr/bin/env python
  #
  # Copyright 2009 Facebook
  #
  # Licensed under the Apache License, Version 2.0 (the "License"); you may
  # not use this file except in compliance with the License. You may obtain
  # a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  # License for the specific language governing permissions and limitations
  # under the License.
  
  import distutils.core
  import sys
  # Importing setuptools adds some features like "setup.py develop", but
  # it's optional so swallow the error if it's not there.
  try:
      import setuptools
  except ImportError:
      pass
  
  kwargs = {}
  
  # Build the epoll extension for Linux systems with Python < 2.6
  extensions = []
  major, minor = sys.version_info[:2]
  python_26 = (major > 2 or (major == 2 and minor >= 6))
  if "linux" in sys.platform.lower() and not python_26:
      extensions.append(distutils.core.Extension(
          "tornado.epoll", ["tornado/epoll.c"]))
  
  version = "2.2.post1"
  
  if major >= 3:
      import setuptools  # setuptools is required for use_2to3
      kwargs["use_2to3"] = True
  
  distutils.core.setup(
      name="tornado",
      version=version,
      packages = ["tornado", "tornado.test", "tornado.platform"],
      package_data = {
          "tornado": ["ca-certificates.crt"],
          "tornado.test": ["README", "test.crt", "test.key", "static/robots.txt"],
          },
      ext_modules = extensions,
      author="Facebook",
      author_email="python-tornado@googlegroups.com",
      url="http://www.tornadoweb.org/",
      download_url="http://github.com/downloads/facebook/tornado/tornado-%s.tar.gz" % version,
      license="http://www.apache.org/licenses/LICENSE-2.0",
      description="Tornado is an open source version of the scalable, non-blocking web server and and tools that power FriendFeed",
      **kwargs
  )
  
new_contents: #!/usr/bin/env python
  #
  # Copyright 2009 Facebook
  #
  # Licensed under the Apache License, Version 2.0 (the "License"); you may
  # not use this file except in compliance with the License. You may obtain
  # a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  # License for the specific language governing permissions and limitations
  # under the License.
  
  import distutils.core
  import sys
  
  kwargs = {}
  
  # Build the epoll extension for Linux systems with Python < 2.6
  extensions = []
  major, minor = sys.version_info[:2]
  python_26 = (major > 2 or (major == 2 and minor >= 6))
  if "linux" in sys.platform.lower() and not python_26:
      extensions.append(distutils.core.Extension(
          "tornado.epoll", ["tornado/epoll.c"]))
  
  version = "2.2.post1"
  
  if major >= 3:
      import setuptools  # setuptools is required for use_2to3
      kwargs["use_2to3"] = True
  
  distutils.core.setup(
      name="tornado",
      version=version,
      packages = ["tornado", "tornado.test", "tornado.platform"],
      package_data = {
          "tornado": ["ca-certificates.crt"],
          "tornado.test": ["README", "test.crt", "test.key", "static/robots.txt"],
          },
      ext_modules = extensions,
      author="Facebook",
      author_email="python-tornado@googlegroups.com",
      url="http://www.tornadoweb.org/",
      download_url="http://github.com/downloads/facebook/tornado/tornado-%s.tar.gz" % version,
      license="http://www.apache.org/licenses/LICENSE-2.0",
      description="Tornado is an open source version of the scalable, non-blocking web server and and tools that power FriendFeed",
      **kwargs
  )
  
subject: Remove optional setuptools import.