Python：迭代器

>>> list = [1,2,3,4]
>>> it = iter(list)   #迭代器创建
>>> next(it)   #访问迭代器，只能通过next()来访问，不能通过索引来访问
1
>>> next(it)
2
>>> next(it)
3
>>> next(it)
4
>>> next(it)   
Traceback (most recent call last):
  File "<pyshell#37>", line 1, in <module>
    next(it)
StopIteration

list=[1,2,3,4]
it = iter(list) # 创建迭代器对象
for x in it:
        print (x, end=" ")

1 2 3 4