code: def update_shared_file(self,
                             sharekey=None,
                             title=None,
                             description=None):
          
          if not sharekey:
              raise Exception(
                  "You must specify a sharekey for the sharedfile"
                  "you wish to update.")
  
          if not (title or description):
              raise Exception("You must specify a title or description.")
  
          post_data = {}
  
          if title:
              post_data['title'] = title
          if description:
              post_data['description'] = description
  
          endpoint = '/api/sharedfile/{0}'.format(sharekey)
  
          data = self._make_request('POST', endpoint=endpoint, data=post_data)
  
          return SharedFile.NewFromJSON(data)
docs: Update the editable details (just the title and description) of a
          SharedFile.
  
          Args:
              sharekey (str): Sharekey of the SharedFile to update.
              title (Optional[str]): Title of the SharedFile.
              description (Optional[str]): Description of the SharedFile
  
          Returns:
              SharedFile on success, 404 on Sharekey not found, 403 on
              unauthorized.