python笔记之迭代器

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# 迭代器本质就是循环（对循环的封装，用来循环可迭代对象）
ls = [3,5,2,1,4]
# 需求：循环打印ls中每一个成员（元素）
print("列表的长度：", ls.__len__())
count = 0
while count < ls.__len__():
    print(ls[count])
    count += 1


# 迭代器变量列表
print() # 加个换行
for num in ls:
    print(num, end=" ")

print()

dic = {"name": "张三", "age": 8, "gender": "男"}
# 问题：如何逐一打印"张三" | 8 | "男"
for key in dic:
    print(key + ":", dic[key])