#key-value(ul)
dic={
    'one':"qqq",
    'two':"www",
    'thre':"eee"
}
#add,change
print(dic['one'])
dic['one']="ppp"#有则改
dic['four']="rrr"#无则加
print (dic)

#del
del dic['four']
print (dic)
dic.pop("thre")
print (dic)

#find
print(dic.get('two'))
print('two' in dic)

#dic.update(dict)#利用字典dict刷新dic 有则更新无则添加

#创建字典 key:1,2,3-value:None
dict.fromkeys([1,2,3],"None")

print (dic)

#循环
for i in dic:
    print(i,dic[i])

for k,v in dic.items():
    print(k,v)