code: def parse(self, data, charset=None):
          
  
          charset = charset or self.charset
          return self._parse_data(data, charset)
docs: Parse the data.
  
          It is usually a better idea to override ``_parse_data()`` than
          this method in derived classes.
  
          :param charset: the charset of the data. Uses datamapper's
          default (``self.charset``) if not given.
          :returns: