Method open

catboost/python-package/catboost/eval/_fold_storage.py:113–117

(self)

        [self.add(line) for line in lines]

    def open(self):
        if self._file is None:
            self._file = open(self._file_path, mode='a')
        else:
            raise CatBoostError("File already opened {}".format(self._file_path))

    def is_opened(self):
        return self._file is not None