python基础语法（5）——字典

1. 字典； 

# # 1. 基本结构
info={
    "k1":"v1", # 键值对的形式
    "k2":"v2"
}

# # 2. 值可以为任何数据类型
info={
    "k1":18,
    "k2":True,
    "k3":[
        11,
        22,
        {
            "k1":"v1",
            "k2":"v2",
            "k3":(1,"2"),
        }
    ],
    "k4":(11,22,33,44)
}
print(info)

# 3. 列表，字典不能作为字典的key
info={
    1:"sdd",
    "k":"ddd",
    True:"ll", # True默认为1，字典的key不能重复
    #[1,2]:"ss" # 会报错
    (1,2):"kk",
    #{1:2}:"pp" #会报错
}

# 4. 字典是无序的，每次输出结果都不一样

# 5. 取值
info={
    "k1":18,
    "k2":True,
    "k3":[
        11,
        22,
        {
            "k1":"v1",
            "k2":"v2",
            "k3":(1,"2"),
        }
    ],
    "k4":(11,22,33,44)
}
# 取值为1的元素
v=info["k3"][2]["k3"][0]
print(v)