1 class Runf:
2
3 def __init__(self,n):
4 self.n=n
5 # def __iter__(self):
6 # return self
7
8 def __next__(self):
9 if self.n==12:
10 raise StopIteration("程序异常终止了！")
11 self.n+=1
12 return self.n
13
14 rf=Runf(10)
15
16 # for i in rf:
17 # print(i)
18 print(next(rf))
19 print(next(rf))
20 # print(next(rf)) #大于12抛异常
21
裴波拉切数列：
1 class Runf:
2
3 def __init__(self):
4 self._a=1
5 self._b=1
6 def __iter__(self):
7 return self
8
9 def __next__(self):
10 self._a,self._b=self._b,self._a+self._b
11 return self._a
12
13 rf=Runf()
14 # print(rf.__next__())
15 # print(rf.__next__())
16 # print(rf.__next__())
17 # print(rf.__next__())
18 # print(rf.__next__())
19 # print(rf.__next__())
20 for i in rf:
21 print(i) #迭代器实现裴波拉切
22
23
24
25 lis=[]
26 for i in range(10):
27 if i==0 or i==1:
28 lis.append(1)
29 else:
30 lis.append(lis[i-2]+lis[i-1])
31 print(lis) #递归实现裴波拉切
32
33 a=0
34 b=1
35 while b<60:
36 print(b)
37 a,b=b,a+b #while循环实现