def _update_info(self):
super(TableHDU, self)._update_info()<EOL>if self._info['<STR_LIT>'] == IMAGE_HDU:<EOL><INDENT>mess = "<STR_LIT>" % self.ext<EOL>raise ValueError(mess)<EOL><DEDENT>if '<STR_LIT>' in self._info:<EOL><INDENT>self._colnames = [i['<STR_LIT:name>'] for i in self._info['<STR_LIT>']]<EOL>self._colnames_lower = [<EOL>i['<STR_LIT:name>'].lower() for i in self._info['<STR_LIT>']]<EOL>self._ncol = len(self._colnames)<EOL><DEDENT>
Call parent method and make sure this is in fact a
table HDU.  Set some convenience data.