range.py 文件源码

def __iter__(self):
            """
            Examples
            --------
            >>> list(range(1))
            [0]
            >>> list(range(5))
            [0, 1, 2, 3, 4]
            >>> list(range(1, 5))
            [1, 2, 3, 4]
            >>> list(range(0, 5, 2))
            [0, 2, 4]
            >>> list(range(5, 0, -1))
            [5, 4, 3, 2, 1]
            >>> list(range(5, 0, 1))
            []
            """
            n = self.start
            stop = self.stop
            step = self.step
            cmp_ = op.lt if step > 0 else op.gt
            while cmp_(n, stop):
                yield n
                n += step