迭代器

迭代器：

from collections import Iterator
isinstance('abc',Iterator)
a = iter('abc')  #iter可以把序列类型变成Iteratable 类型
print(isinstance(a,Iterator))
print(a.__next__())
print(a.__next__())
print(a.__next__())






生成器用迭代器迭代：

from collections import Iterator
def func(n):
    count=0
    while count<n:
        count+=1
        yield count
        print(count)
ss = func(3)
next(ss)
next(ss)
print(isinstance(iter(ss),Iterator))
next(ss)