old_contents: import abc
  
  import six
  
  
  @six.add_metaclass(abc.ABCMeta)
  class AskX(object):
  
      def get_instance(self):
          return self
  
      @abc.abstractmethod
      def __call__(self):
          return
  
new_contents: import abc
  
  import six
  
  
  @six.add_metaclass(abc.ABCMeta)
  class AskX(object):
  
      @classmethod
      def get_instance(cls, *args, **kwargs):
          return cls(*args, **kwargs)
  
      @abc.abstractmethod
      def __call__(self):
          return
  
subject: Adjust get_instance