code: def create_file(self, filename):
      
      self.response.write('Creating file %s\n' % filename)
  
      write_retry_params = gcs.RetryParams(backoff_factor=1.1)
      gcs_file = gcs.open(filename,
                          'w',
                          content_type='text/plain',
                          options={'x-goog-meta-foo': 'foo',
                                   'x-goog-meta-bar': 'bar'},
                          retry_params=write_retry_params)
      gcs_file.write('abcde\n')
      gcs_file.write('f'*1024*4 + '\n')
      gcs_file.close()
      self.tmp_filenames_to_clean_up.append(filename)
docs: Create a file.
  
      The retry_params specified in the open call will override the default
      retry params for this particular file handle.
  
      Args:
        filename: filename.