old_contents: from  django.utils import timezone
  
  
  def getCurDateTime():
      return timezone.now()
  
  def toJSON(self):
      fields = []
      for field in self._meta.fields:
          fields.append(field.name)
  
      d = {}
      for attr in fields:
          d[attr] = getattr(self, attr)
  
      import json
      return json.dumps(d)
  
  
new_contents: from  django.utils import timezone
  
  
  def getCurDateTime():
      return timezone.now()
  
  def toJSON(self):
      fields = []
      for field in self._meta.fields:
          fields.append(field.name)
  
      d = {}
      for attr in fields:
          d[attr] = getattr(self, attr)
  
      import json
      return json.dumps(d)
  
  def not_response():
      """
      indicate this function don't response to anything
      """
subject: ADD NOT_RESPONSE