class Foo: def __init__(self,n): self.n=n def __iter__(self): return self def __next__(self): if self.n == 13: raise StopIteration('终止了') self.n+=1 return self.n # l=list('hello') # for i in l: # print(i) f1=Foo(10) # print(f1.__next__()) # print(f1.__next__()) # print(f1.__next__()) # print(f1.__next__()) for i in f1: # obj=iter(f1)------------>f1.__iter__() print(i) #obj.__next_()