# 对字典的遍历
dict_my ={"class":"python17","goal":"翻倍"}
for item in dict_my:
    print(item)
    print(dict_my[item]) #会把key value 一起打印出来

# 获取所有键值的函数：dict_my.keys（）
# 获取所有值的函数：dict_my.values()
# 获取所有键值对的函数：dict_my.items（）
# print(dict_my.keys())
#
# print(dict_my.values())
# print(dict_my.items())
# 遍历值的方式：
# print(dict_my.keys())
# for item in dict_my.keys():
#     print(item)
#     print(dict_my[item])
# print(dict_my.values())
# print(dict_my.items())
# 键值对遍历方式：
# for key,value in dict_my.items():
#     print("===")
#     print(key)
#     print(value)
# 双重for循环   代码的复杂度，一般最多就两重for循环
# 抽奖活动
# 活动礼品：行李箱、签字笔、水杯、零食
# 5个人;冰天，兰溪，粽子，alex，巴巴
# 每个人每一样礼品都去领取  =遍历了所有的礼品
# gifts = ["行李箱","签字笔","水杯","零食","水果"]


# # 遍历每一个同学，每个同学，每一样礼品都去领取
#
stus = ["xiao箱","xiao笔","xiao杯","xiao食","xiao果"]
gifts = ["行李箱","签字笔","水杯","零食","水果"]
for stu in stus:
    print("========================")
    print("每一个同学：{}".format(stu))
    for gift in gifts:
        print("领取礼品:{}".format(gift))