付録・リスト操作命令

命令一覧

命令	内容
append	最後に値を追加
extend	最後にリストを追加
insert	値の挿入
remove	指定値の最初の値を削除
pop	指定インデックス又は最後の値を削除し削除値を返す
clear	全ての値を削除
index	指定値を探しインデックスを返す
count	指定値の出現回数を返します
sort	並び替え
reverse	リストの並びを反転します
copy	リストをコピーし返します

append

例)最後に6を追加

>>> hensu = [1,2,3,4,5]
>>> hensu.append(6)
>>> print(hensu)
[1, 2, 3, 4, 5, 6]

>>> hensu = [1,2,3,4,5]

>>> hensu.append(6)

>>> print(hensu)

[1, 2, 3, 4, 5, 6]

extend

< 例)リストhensuの最後にリストhensu2を追加

>>> hensu = [1,2,3,4,5]
>>> hensu2 = [6,7,8]
>>> hensu.extend(hensu2)
>>> print(hensu)
[1, 2, 3, 4, 5, 6, 7, 8]

>>> hensu = [1,2,3,4,5]

>>> hensu2 = [6,7,8]

>>> hensu.extend(hensu2)

>>> print(hensu)

[1, 2, 3, 4, 5, 6, 7, 8]

insert

例)リストhensuの2番目の前に9を挿入

>>> hensu = [1,2,3,4,5]
>>> hensu.insert(2,9)
>>> print(hensu)
[1, 2, 9, 3, 4, 5]

>>> hensu = [1,2,3,4,5]

>>> hensu.insert(2,9)

>>> print(hensu)

[1, 2, 9, 3, 4, 5]

remove

例)リストhensu内の最初の3を削除

>>> hensu = [1,2,3,4,5,4,3,2,1]
>>> hensu.remove(3)
>>> print(hensu)
[1, 2, 4, 5, 4, 3, 2, 1]

>>> hensu = [1,2,3,4,5,4,3,2,1]

>>> hensu.remove(3)

>>> print(hensu)

[1, 2, 4, 5, 4, 3, 2, 1]

pop

例)リストhensuの2番目を削除、最後を削除

>>> hensu = [1,2,3,4,5]
>>> hensu.pop(2)
3
>>> print(hensu)
[1, 2, 4, 5]
>>> hensu.pop()
5
>>> print(hensu)
[1, 2, 4]
>>>

>>> hensu = [1,2,3,4,5]

>>> hensu.pop(2)

>>> print(hensu)

[1, 2, 4, 5]

>>> hensu.pop()

>>> print(hensu)

[1, 2, 4]

>>>

clear

リストhensuの全ての値を削除

>>> hensu = [1,2,3,4,5]
>>> hensu.clear()
>>> print(hensu)
[]

>>> hensu = [1,2,3,4,5]

>>> hensu.clear()

>>> print(hensu)

[]

index

例)リストhensuから"Tuesday"が何番目にあるか、また範囲指定(3番目から4番目)し探し何番目にあるか

>>> hensu = ["Sunday","Monday","Tuesday","Wednesday","Tuesday"]
>>> hensu.index("Tuesday")
2
>>> hensu.index("Tuesday",3,5)
4

>>> hensu = ["Sunday","Monday","Tuesday","Wednesday","Tuesday"]

>>> hensu.index("Tuesday")

>>> hensu.index("Tuesday",3,5)

count

リストhensuに"A"が何個あるか

>>> hensu = ["A","B","C","A","B","A"]
>>> hensu.count("A")
3

>>> hensu = ["A","B","C","A","B","A"]

>>> hensu.count("A")

sort

リストhensuを昇順、降順に並び替える

>>> hensu = [3,7,5,4,1]
>>> hensu.sort()
>>> print(hensu)
[1, 3, 4, 5, 7]
>>> hensu.sort(reverse=True)
>>> print(hensu)
[7, 5, 4, 3, 1]

>>> hensu = [3,7,5,4,1]

>>> hensu.sort()

>>> print(hensu)

[1, 3, 4, 5, 7]

>>> hensu.sort(reverse=True)

>>> print(hensu)

[7, 5, 4, 3, 1]

reverse

リストhensuの並びを反転

>>> hensu = ["Sunday","Monday","Tuesday","Wednesday"]
>>> hensu.reverse()
>>> print(hensu)
['Wednesday', 'Tuesday', 'Monday', 'Sunday']

>>> hensu = ["Sunday","Monday","Tuesday","Wednesday"]

>>> hensu.reverse()

>>> print(hensu)

['Wednesday', 'Tuesday', 'Monday', 'Sunday']

copy

リストhensuをコピーし返す

>>> hensu = [1,2,3,4,5]
>>> hensu.copy()
[1, 2, 3, 4, 5]

>>> hensu = [1,2,3,4,5]

>>> hensu.copy()

[1, 2, 3, 4, 5]