code: def delete(self, key):
          
          data = None
          if key is not None:
              data = self.db.delete(key.strip())
          else:
              self.tcex.log.warning(u'The key field was None.')
          return data
docs: Delete method of CRUD operation for all data types.
  
          Args:
              key (string): The variable to write to the DB.
  
          Returns:
              (string): Result of DB write.