window.py 文件源码

def rangeBetween(self, start, end):
        """
        Defines the frame boundaries, from `start` (inclusive) to `end` (inclusive).

        Both `start` and `end` are relative from the current row. For example,
        "0" means "current row", while "-1" means one off before the current row,
        and "5" means the five off after the current row.

        We recommend users use ``Window.unboundedPreceding``, ``Window.unboundedFollowing``,
        and ``Window.currentRow`` to specify special boundary values, rather than using integral
        values directly.

        :param start: boundary start, inclusive.
                      The frame is unbounded if this is ``Window.unboundedPreceding``, or
                      any value less than or equal to max(-sys.maxsize, -9223372036854775808).
        :param end: boundary end, inclusive.
                    The frame is unbounded if this is ``Window.unboundedFollowing``, or
                    any value greater than or equal to min(sys.maxsize, 9223372036854775807).
        """
        if start <= Window._PRECEDING_THRESHOLD:
            start = Window.unboundedPreceding
        if end >= Window._FOLLOWING_THRESHOLD:
            end = Window.unboundedFollowing
        return WindowSpec(self._jspec.rangeBetween(start, end))