old_contents: 
  
  # Copyright 2017 Google Inc.
  #
  # 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.
  
  from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
  
  class SimpleHTTPRequestHandler(BaseHTTPRequestHandler):
    def do_GET(self):
      self.send_response(200)
      self.send_header('Content-type','text/plain')
      self.end_headers()
      self.wfile.write('Hello GCP dev!')
      return
  
    
  def run():
    print('Server is starting...')
    server_address = ('0.0.0.0', 80)
    server = HTTPServer(server_address, SimpleHTTPRequestHandler)
    print('Started. Press Ctrl + C to stop')
    server.serve_forever()
    
  if __name__ == '__main__':
    run()
new_contents: 
  
  # Copyright 2017 Google Inc.
  #
  # 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.
  
  try:
    from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
  except ImportError:
    from http.server import BaseHTTPRequestHandler, HTTPServer
  
  class SimpleHTTPRequestHandler(BaseHTTPRequestHandler):
    def do_GET(self):
      self.send_response(200)
      self.send_header('Content-type','text/plain')
      self.end_headers()
      self.wfile.write(b'Hello GCP dev!')
      return
  
    
  def run():
    print('Server is starting...')
    server_address = ('0.0.0.0', 80)
    server = HTTPServer(server_address, SimpleHTTPRequestHandler)
    print('Started. Press Ctrl + C to stop')
    server.serve_forever()
    
  if __name__ == '__main__':
    run()
  
subject: Fix ImportError and use bytes in outstream