python 中实现对象的反向迭代
2017-12-11 本文已影响0人
北冢
class FloatRange:
def __init__(self, start, end, step=0.1):
self.start = start
self.end = end
self.step = step
def __iter__(self):
t = self.start
while t <= self.end:
yield t
t += self.step
def __reversed__(self):
t = self.end
while t >= self.start:
yield t
t -= self.step
print("=====正向迭代=====")
for x in FloatRange(1.0, 4.0, 0.5):
print(x)
print("=====反向迭代=====")
for x in reversed(FloatRange(1.0, 4.0, 0.5)):
print(x)
