迭代器实现斐波那契数列

 1 #Author : Kelvin
 2 #Date : 2019/1/22 20:02
 3 class Fi:
 4     def __init__(self):
 5         self.a=1
 6         self.b=1
 7     def __iter__(self):
 8         return self
 9     def __next__(self):
10         if self.b>100:
11             raise StopIteration("out of range")
12         self.a,self.b=self.b,self.a+self.b
13         return self.a
14 import time
15 f=Fi()
16 for i in f:
17     print(i)
18     time.sleep(1)