@property
    def fieldnames(self):
        if self._fieldnames is None:
            try:
                self._fieldnames = next(self.reader)
            except __HOLE__:
                pass
        self.line_num = self.reader.line_num
        return self._fieldnames
dataset/ETHPy150Open amrdraz/kodr/app/brython/www/src/Lib/csv.py/DictReader.fieldnames