old_contents: # coding=utf-8
  from .fetch import fetch, fetch_field
  
  
  class Wall(object):
      """
      https://vk.com/dev/post
      """
      def __init__(self, data_json):
          self._data = data_json
  
      @property
      def id(self):
          return self._data['id']
  
      @property
      def owner_id(self):
          return self._data['owner_id']
  
      @property
      def from_id(self):
          return self._data['from_id']
  
      @property
      def date(self):
          return self._data['date']
  
      @property
      def text(self):
          return self._data['text']
  
      @property
      def reply_owner_id(self):
          return self._data['reply_owner_id']
  
      @property
      def reply_post_id(self):
          return self._data['reply_post_id']
  
      @property
      def friends_only(self):
          return self._data['friends_only']
  
      @property
      def comments_count(self):
          return self._data['comments']['count']
  
      @property
      def likes_count(self):
          return self._data['likes']['count']
  
      @property
      def reposts_count(self):
          return self._data['reposts']['count']
  
      @property
      def post_type(self):
          return self._data['post_type']
  
      @property
      def attachments(self):
          raise NotImplementedError
  
      @property
      def geo(self):
          raise NotImplementedError
  
      @property
      def signer_id(self):
          raise NotImplementedError
  
      @property
      def copy_history(self):
          raise NotImplementedError
  
      @property
      def is_pinned(self):
          return bool(self._data['is_pinned'])
  
      def get_url(self):
          return 'https://vk.com/wall{0}_{1}'.format(self.owner_id, self.id)
  
      @staticmethod
      def get_wall(owner_id):
          response = fetch("wall.get", owner_id=owner_id)
          wall_items = response['items']
          return [Wall(wall_json) for wall_json in wall_items]
  
      @staticmethod
      def get_wall_count(owner_id):
          response = fetch("wall.get", owner_id=owner_id, count=1)
          wall_count = response.get('count')
          return wall_count
  
      def __repr__(self):
          return u"<Wall id{0}>".format(self.id)
  
new_contents: # coding=utf-8
  from .fetch import fetch, fetch_field
  
  
  class Wall(object):
      """
      https://vk.com/dev/post
      """
      def __init__(self, data_json):
          self._data = data_json
  
      @property
      def id(self):
          return self._data.get('id')
  
      @property
      def owner_id(self):
          return self._data.get('owner_id')
  
      @property
      def from_id(self):
          return self._data.get('from_id')
  
      @property
      def date(self):
          return self._data.get('date')
  
      @property
      def text(self):
          return self._data.get('text')
  
      @property
      def reply_owner_id(self):
          return self._data.get('reply_owner_id')
  
      @property
      def reply_post_id(self):
          return self._data.get('reply_post_id')
  
      @property
      def friends_only(self):
          return self._data.get('friends_only')
  
      @property
      def comments_count(self):
          return self._data.get('comments')['count']
  
      @property
      def likes_count(self):
          return self._data.get('likes')['count']
  
      @property
      def reposts_count(self):
          return self._data.get('reposts')['count']
  
      @property
      def post_type(self):
          return self._data.get('post_type')
  
      @property
      def attachments(self):
          raise NotImplementedError
  
      @property
      def geo(self):
          raise NotImplementedError
  
      @property
      def signer_id(self):
          raise NotImplementedError
  
      @property
      def copy_history(self):
          raise NotImplementedError
  
      @property
      def is_pinned(self):
          return bool(self._data.get('is_pinned'))
  
      def get_url(self):
          return 'https://vk.com/wall{0}_{1}'.format(self.owner_id, self.id)
  
      @staticmethod
      def get_wall(owner_id):
          response = fetch("wall.get", owner_id=owner_id)
          wall_items = response['items']
          return [Wall(wall_json) for wall_json in wall_items]
  
      @staticmethod
      def get_wall_count(owner_id):
          response = fetch("wall.get", owner_id=owner_id, count=1)
          wall_count = response.get('count')
          return wall_count
  
      def __repr__(self):
          return u"<Wall id{0}>".format(self.id)
  
subject: Use `dict.get`