字典的魔法（一）

字典

1、字典的基本结构

 

info = {"k1":18,"kw":True,"k3":[11,[],(),22,33,{"kk1":"vv1","kk2":"vv2","kk3":(11,22),}],"k4":(11,22,33,44)}
print(info)

 

2、字典的value可以是任何值

info = {"k1":18,"kw":True,"k3":[11,[],(),22,33,{"kk1":"vv1","kk2":"vv2","kk3":(11,22),}],"k4":(11,22,33,44)}
print(info)



3、布尔值(1,0)，列表，字典不能作为字典的key

info = {1:"asdf","k1":"asdf",True:"123",#[11,22]:123,(11,22):123,#{"k1":"v1"}:123}

print(info)

4、字典是无序的

5、索引方式找到指定元索

info = {1:"asdf","k1":"asdf",4:"123",(11,22):123,}
v = info["k1"]
print(v)

info = {1:"asdf","k1":"asdf",4:"123",(11,22):123,}
v = info[4]
print(v)

6、字典支持del删除

info = {1:"asdf","k1":"asdf",4:"123",(11,22):123,}
del info["k1"]
print(info)

 7、for循环

info = {"k1":18,2:True,"k3":[11,[],(),22,33,{"kk1":"vv1","kk2":"vv2","kk3":(11,22),}],"k4":(11,22,33,44)}
for item in info:
    print(item)

info = {"k1":18,2:True,"k3":[11,[],(),22,33,{"kk1":"vv1","kk2":"vv2","kk3":(11,22),}],"k4":(11,22,33,44)}
for item in info.keys():
    print(item)