迭代器 1.什么是可迭代对象 字符串.列表.元组.字典.集合都可以被for循环,说明他们都是可迭代的. from collections import Iterable l = [1,2,3,4] t = (1,2,3,4) d = {1:2,3:4} s = {1,2,3,4} print(isinstance(l,Iterable)) print(isinstance(t,Iterable)) print(isinstance(d,Iterable)) print(isinstance(s,…