字典的使用

#字典的特性
#    。dict是无序的
#    。key必须是唯一的，so天生去重

dixt = {'caicai':33 , 'wuwu':22}

of = {'xingming':'caicai' ,"age":33,"opne":13421731046,"qq":75738369}
#如果有xingming这个key存在，就修改，如果不存在就创建
of["xingming"] = "菜菜"
of["XingM"] = "菜菜"
##删除
del of["XingM"]
of.pop("xingming")
#随机删除
of.popitem()

#查找--如果没有找到就返回None，找到就返回值
print(of.get("opne"))
#查找--如果找到就返回True，没有找到就返回False
print('opne' in of)

print(of)

###多层嵌套
catalog = {
    "oumei":{"www01":["01","01"],"www02":"02","www03":"03"},
"rihan":{"www04":"04","www05":"05","www06":"06"},
"dalu":{"www07":"07","www08":"08","www09":"09"}
}
###修改一个值
catalog["oumei"]["www01"][1] = "08"
print(catalog)

##如果有这个字典就更新，没有就创建
b = {'dalu': {'www17': '17', 'www18': '18', 'www19': '19'}}
catalog.update(b)
print(catalog)

#字典中的循环
for i in catalog:
    print(i,catalog[i])

##会先把dict转成tuple，数据量大时莫用
for k, v in catalog.items():
    print(k,v)