dict的操作和三级菜单

dict的基本操作

# Author:nadech

info = {
    "stu001":"sjp",
    "stu002":"cxx",
    "stu003":"lsw"
}

print(info)
#########查#######
#确定有这个值才用这种方法
print(info["stu001"])
#安全的获取方法
print(info.get("stu005"))
#判断是否存在
print("stu002" in info)#在python2中与info.has_key("stu002")一样

#########增#######
info["stu004"] ="dyq"
print(info)
#########改#######
info["stu001"] ="sjpppp"
print(info)
##########删######
#info.popitem()这个是随机删除
info.pop("stu001")
print(info)
del info["stu002"]
print(info)

av_dicionary = {
    "europe":{"":["a","b","c"],
               2:["d","e","f"]
              },
    "america":{3:["g","h","i"],
               4:["j","k","l"]
               },
    "tokyo":{6:["m","n","o"],
              7:["p","q","r"]
             }
}
#查
print(av_dicionary["tokyo"][6][0])
print((av_dicionary.get("tokyo")).get(6))

#改
av_dicionary["tokyo"][6][0] = "mmmmmmm"
print(av_dicionary)
#
av_dicionary.setdefault("tokyo","www.baidu.com")
print(av_dicionary)
av_dicionary.setdefault("taiwan",{"wwww.baidu.com":["hahahah","henhaoyong"]})
print(av_dicionary)

info1 = {"s01":"nadech","s02":"aguilera","s03":"lsw"}
print(info1)
info2 = {1:2,"s03":"lswwww",3:4}
print(info2)
info1.update(info2)###跟新字典，存在的key值就将value更新，不存在的就加进去
print(info1)

#将字典转化为列表
print(info1.items())

#初始化字典使用fromkeys,当有多层列表时，它只是这个数据的引用，当修改一个字典的数据时，其他的也都会修改
c = dict.fromkeys([6,7,8],["a",{1:"nadech"},2])
print(c)
c[6][1][1] = "aguilera"
print(c)

####字典的循环

###推荐使用这个，因为更高效
for i in  info1:
    print(i,info1[i])

for i,v in info1.items():
    print(i,v)

三级菜单

# Author:nadech

data = {
    "江苏":{
        "南京":{
            "栖霞":["南邮仙林校区","南师范仙林校区","南财仙林校区"],
            "鼓楼":["紫峰大厦","新街口","湖南路"]
        },
        "苏州":{},
        "无锡":{}
    },
    "河南":{},
    "云南":{}
}
print(data["江苏"]["南京"]["栖霞"])

exit_flag = False
while not exit_flag:
    for i in data:
        print(i)
    #判断输入是否在所存在的省份中
    choice1 = input(">>>请选择省份：")

    if choice1 in data:

        for j in data[choice1]:
            print(j)
        #判断输入是否在所存在的城市中
        choice2 = input(">>>请选择城市：")
        if choice2 in data[choice1]:
            for k in data[choice1][choice2]:
                print(k)
            #判断输入的行政区是否存在
            choice3 = input(">>>请选择行政区：")
            if choice3 in data[choice1][choice2]:
                print(data[choice1][choice2][choice3])
            else:
                print("您的输入有误！")
        else:
            print("您的输入有误！")

    else:
        print("您的输入有误！")