字典

查字典：

name = [["a",23,"yue"],["b",26,"bnt"],["cd",35,"by"],]

print(name.index(["a",23,"yue"])) #要全部输入才能查到，不能只输入部分字符

name = {
    123:{"age":33,"name":"alex"},
    234:{"age":52,"name":"nuy"},
    345:["liu"],
}

print(name[345])  #茶字典
print(name[123]["name"])  #茶字典具体的姓名

 

#字典的特点：
#1、key是唯一的
#2、数据必须是无序的

#改
name[345][0]="jensen"
print(name)

#追加
name[345].append("xie")
print(name)

#插入
name[222]="mike"
print(name)

#删
print(name.pop(345,None)) #删除指定的key,如果没有那个key,返回none
print(name)

print(name.popitem()) #随机删除某个数据
print(name)

name.pop(345,None)
name.popitem

del name[222] #删除

#查
print(name.get(123)) #看是否存在某个ID
print(123 in name) #看是否存在某个key

#循环
for i in name:
    print(i,name[i])

for i in name.items():
    print(i)

for k,v in name.items(): #不要用，效率不高
    print(i)

#更新
name = {
    123:{"age":33,"name":"alex"},
    234:{"age":52,"name":"nuy"},
    345:["liu"],
}

dic2={
    345:{"age":23,"name":"yy"},
    456:{"age":45,"name":"zz"},
}

name.update(dic2) #更新字典：对于同样key,用新的，没有的key，就添加
print(name)