迭代对象Iterable和迭代器Iterator

__author__ = 'admin'from collections.abc import Iteratorfrom collections.abc import  Iterableprint(isinstance([],Iterable))print(isinstance((),Iterable))print(isinstance({},Iterable))print(isinstance('hello',Iterable))    #Iterableb = isinstance((x for x in range(5)),Iterator)  #Iterator  could be caught by __next__()print(b)print(isinstance(iter('hello'),Iterator))  # #  iter(Itreable) into Iterator# 首先获得Iterator对象:it = iter([1, 2, 3, 4, 5])# 循环:while True:    try:        # 获得下一个值:        x = next(it)        print(x)    except StopIteration:        # 遇到StopIteration就退出循环        break