元組

Python的元組與列表類似，不同之處在于元組的元素不能修改。元組使用小括號(hào)，列表使用方括號(hào)。

元組的格式

變量名=(,,,,)

aTuple=(23,35,56,34,11,21)

訪問(wèn)元組

通過(guò)索引取數(shù)據(jù)

?? 案例:索引值存在

aTuple=(23,35,56,34,11,21)print(aTuple[2])

查詢個(gè)數(shù)

count查詢出現(xiàn)的個(gè)數(shù)

aTuple=('b','c','d','e','f','g')print(aTuple.count('d'))

查詢索引

index：查詢?cè)氐乃饕?，有?duì)應(yīng)的元素返回對(duì)應(yīng)的索引，否則報(bào)錯(cuò)

修改數(shù)據(jù)(不能修改)

aTuple=('b','c','d','e','f','g')aTuple[1]=23

類型轉(zhuǎn)換

列表轉(zhuǎn)換元組

aa=[23,34,45,56,67]tuple(aa)print(aa)

元組轉(zhuǎn)換列表

aTuple=('b','c','d','e','f','g')a=list(aTuple)print(a)

元組的循環(huán)取值

aTuple=('b','c','d','e','f','g')foriinaTuple:print(i)

字典

變量名={key1:value,key2:value,,,}

info={"name":"anfly","age":12,"sex":"男"}

根據(jù)鍵訪問(wèn)值

info={"name":"anfly","age":18,"sex":"男"}print(info["name"])

修改元素

info={"name":"anfly","age":12,"sex":"男"}info["age"]=14print(info)

添加元素

info={"name":"anfly","age":12,"sex":"男"}info["gender"]="屬雞"print(info)

刪除元素

案例：刪除整個(gè)字典

info={"name":"anfly","age":12,"sex":"男"}delinfoprint(info)

clear清空

info={"name":"anfly","age":12,"sex":"男"}info.clear()print(info)

查詢長(zhǎng)度

info={"name":"anfly","age":12,"sex":"男"}print(len(info))

字典中循環(huán)

info={"name":"anfly","age":12,"sex":"男"}foriininfo.keys():print(i)

取出字典中的key和value

info={"name":"anfly","age":12,"sex":"男"}foriininfo.keys():print(i,info[i])