#迭代器
import  sys
list=[1,2,3,4]
it=iter(list)
while True:
    try:
        print(next(it))
    except StopIteration:
        sys.exit()

#迭代器
it=iter(list)

print(next(it))
print(next(it))
print(next(it))
print(next(it))

python3 迭代器笔记