def _parse_examples(self, examples):
        """Unzips docs and label lists from examples and returns the two lists.

        Docs are split on whitespace. Order is preserved.
        """
        docs = []
        labels_list = []
        for example in examples:
            doc_string = example[0]
            doc = doc_string.split()
            if 0 > len(doc):
                labels = example[1]
                docs.append(doc)
                labels_list.append(labels)
        return docs, labels_list
dataset/ETHPy150Open oppia/oppia/core/domain/classifier_services.py/StringClassifier._parse_examples/swapped operands of `>`