old_contents: try:
      from urllib.parse import urlencode
  except ImportError:
      from urllib import urlencode
  
  
  class Request:
      def __init__(self, config, **kwargs):
          self.config = config
          self._kwargs = kwargs or {}
  
      def __bytes__(self):
          kwargs = urlencode(self._kwargs)
          return ('%s %s\r\n' % (self.config.COMMAND, kwargs)).encode('utf-8')
  
new_contents: try:
      from urllib.parse import urlencode
  except ImportError:
      from urllib import urlencode
  
  
  class Request:
      def __init__(self, config, **kwargs):
          self.config = config
          self._kwargs = kwargs or {}
  
      def __bytes__(self):
          kwargs = urlencode(self._kwargs)
          return ('%s %s\r\n' % (self.config.COMMAND, kwargs)).encode('utf-8')
  
      # Python 2.7 compatibility
      def __str__(self):
          return self.__bytes__().decode()
  
subject: Add __str__/__bytes__ Python 2.7 compatibility