Python编程举例-iter和next结合定制可迭代对象
class Foo:
def __init__(self,n):
self.n = n
def __iter__(self):
return self
def __next__(self):
if self.n == 15:
raise StopIteration('终止了')
self.n +=1
return self.n
f1 = Foo(10)
print(f1.__next__())
print(f1.__next__())
print(next(f1))
print(next(f1))
for i in f1: #调用对象的Iter方法iter(f1)--->f1.__iter__()
print(i)#Iter的本质是去调用next方法