old_contents: """Provide the ReplyableMixin class."""
  from ....const import API_PATH
  
  
  class ReplyableMixin:
      """Interface for RedditBase classes that can be replied to."""
  
      def reply(self, body):
          """Reply to the object.
  
          :param body: The Markdown formatted content for a comment.
          :returns: A :class:`~.Comment` object for the newly created
              comment or ``None`` if Reddit doesn't provide one.
  
          A ``None`` value can be returned if the target is a comment or
          submission in a quarantined subreddit and the authenticated user
          has not opt-ed in to viewing the content. When this happens the
          comment will be sucessfully created on Reddit and can be retried
          by drawing the comment from the user's comment history.
  
          .. note:: Some items, such as locked submissions/comments or
              non-replyable messages will throw ``prawcore.exceptions.Forbidden``
              when attempting to reply to them.
  
          Example usage:
  
          .. code-block:: python
  
             submission = reddit.submission(id='5or86n')
             submission.reply('reply')
  
             comment = reddit.comment(id='dxolpyc')
             comment.reply('reply')
  
          """
          data = {"text": body, "thing_id": self.fullname}
          comments = self._reddit.post(API_PATH["comment"], data=data)
          try:
              return comments[0]
          except IndexError:
              return None
  
new_contents: """Provide the ReplyableMixin class."""
  from ....const import API_PATH
  
  
  class ReplyableMixin:
      """Interface for RedditBase classes that can be replied to."""
  
      def reply(self, body: str):
          """Reply to the object.
  
          :param body: The Markdown formatted content for a comment.
          :returns: A :class:`~.Comment` object for the newly created
              comment or ``None`` if Reddit doesn't provide one.
  
          A ``None`` value can be returned if the target is a comment or
          submission in a quarantined subreddit and the authenticated user
          has not opt-ed in to viewing the content. When this happens the
          comment will be sucessfully created on Reddit and can be retried
          by drawing the comment from the user's comment history.
  
          .. note:: Some items, such as locked submissions/comments or
              non-replyable messages will throw ``prawcore.exceptions.Forbidden``
              when attempting to reply to them.
  
          Example usage:
  
          .. code-block:: python
  
             submission = reddit.submission(id='5or86n')
             submission.reply('reply')
  
             comment = reddit.comment(id='dxolpyc')
             comment.reply('reply')
  
          """
          data = {"text": body, "thing_id": self.fullname}
          comments = self._reddit.post(API_PATH["comment"], data=data)
          try:
              return comments[0]
          except IndexError:
              return None
  
subject: Add types to praw/models/reddit/mixins/replyable.py