python字典

键值对组成的可变映射容器(可变)
映射：一对一的对应关系，曲每条记录无序
键必须唯一且不可变，值没有限制
创建字典

#创建字典
dict01={}
dict01=dict()
#默认值
dict01={"wj":100,"zm":80,"zr":90}
dict02=dict([("a","b"),("c","d")])
#查找元素(根据key查找value)
print(dict01["a"])
#修改元素
dict101['a'] = "BB"
#添加
dict101['e'] = "f"
#删除
del dict01['a']
#遍历字典得到的是key
for item in dict01:
	print(dict01[item])
#遍历字典得到的是value
for value in dict01.values():
	print(value)

#遍历字典得到的键值对 key value
for value in dict01.items():
	print(item[0])
	print(item[1])

for k,y in dict01.items():
	print(k)
	print(y)

dict01 = {}
while True:
    name = input("请输入商品名称")

    if name == "":
        break
    price = input("请输入单价：")
    if name not in dict01:
        dict01[name] = price
for key, value in dict01.items():
    print(key + "=>" + value)

dict01 = {}

while True:
    name = input("请输入学生姓名")

    if name == "":
        break
    age = input("请输入年龄：")
    score = input("请输入成绩：")
    sex = input("请输入性别：")
    if name not in dict01:
        dict01[name] = [age, score, sex]
print(dict01)
for key, value in dict01.items():
    print("%s性别%s%s成绩为%s" % (key, value[2], value[0], value[1]))

dict01 = {}

while True:
    name = input("请输入学生姓名")

    if name == "":
        break
    age = input("请输入年龄：")
    score = input("请输入成绩：")
    sex = input("请输入性别：")
    if name not in dict01:
        dict01[name] = {"age":age, "score":score, "sex":sex}
print(dict01)
for key, value in dict01.items():
    print("%s性别%s%s成绩为%s" % (key, value["sex"], value["age"], value["score"]))

list_peron =[]
while True:
    name = input("请输入姓名：")
    if name == "":
        break
    dict01={name:[]}
    list_peron.append(dict01)
    while True:
        hbit = input("请输入喜好：")
        if hbit == "":
            break
        dict01[name].append(hbit)
for item in list_peron:
    print(item)

list_peron ={}
while True:
    name = input("请输入姓名：")
    if name == "":
        break
    list_peron[name] = []

    while True:
        hbit = input("请输入喜好：")

        if hbit == "":
            break
        list_peron[name].append(hbit)
for item in list_peron.items():
    print(item)

list01=[item for item in range(1970,2051) if item % 4 == 0 and item % 100 != 0 or item % 400 == 0 ]
dict01 = {
    "北京": {
        "景区": ["故宫", "天安门", "天坛"],
        "美食": ["烤鸭", "炸酱面", "豆汁"]
    },
    "四川": {
        "景区": ["九寨沟", "峨眉山", "春熙路"],
        "美食": ["火锅", "串串香", "兔头"]
    }
}
print(dict01['四川']['美食'])

dict01 = {}
str_input = "abcdefce"

for i in str_input:
    if i in dict01:
        dict01[i] += 1
    else:
        dict01[i] = 1
for key, value in dict01.items():
    print("%s : %d" % (key, value))