string.py 文件源码

def __init__(self, pattern, keys=None):
        # type: (Union[Text, regex._pattern_type, re._pattern_type], Optional[Sequence[Text]]) -> None
        """
        :param pattern:
            Regex used to split incoming string values.

            IMPORTANT:  If you specify your own compiled regex, be sure
            to add the ``UNICODE`` flag for Unicode support!

        :param keys:
            If set, the resulting list will be converted into an
            OrderedDict, using the specified keys.

            IMPORTANT:  If ``keys`` is set, the split value's length
            must be less than or equal to ``len(keys)``.
        """
        super(Split, self).__init__()

        self.regex = (
            pattern
                if isinstance(pattern, (regex._pattern_type, re._pattern_type))
                else regex.compile(pattern, regex.UNICODE)
        )

        self.keys = keys