Python リスト内の指定位置にある2つの要素を入れ替える
リストを定義し、リスト内の指定位置にある2つの要素を入れ替えます。
例えば、1番目と3番目の要素を入れ替えます：
对调前 : List = [23, 65, 19, 90], pos1 = 1, pos2 = 3 对调后 : [19, 65, 23, 90]
例 1
def swapPositions(list, pos1, pos2):
list[pos1], list[pos2] = list[pos2], list[pos1]
return list
List = [23, 65, 19, 90]
pos1, pos2 = 1, 3
print(swapPositions(List, pos1-1, pos2-1))
list[pos1], list[pos2] = list[pos2], list[pos1]
return list
List = [23, 65, 19, 90]
pos1, pos2 = 1, 3
print(swapPositions(List, pos1-1, pos2-1))
上記の例の出力結果は次のとおりです：
[19, 65, 23, 90]
例 2
def swapPositions(list, pos1, pos2):
first_ele = list.pop(pos1)
second_ele = list.pop(pos2-1)
list.insert(pos1, second_ele)
list.insert(pos2, first_ele)
return list
List = [23, 65, 19, 90]
pos1, pos2 = 1, 3
print(swapPositions(List, pos1-1, pos2-1))
first_ele = list.pop(pos1)
second_ele = list.pop(pos2-1)
list.insert(pos1, second_ele)
list.insert(pos2, first_ele)
return list
List = [23, 65, 19, 90]
pos1, pos2 = 1, 3
print(swapPositions(List, pos1-1, pos2-1))
上記の例の出力結果は次のとおりです：
[19, 65, 23, 90]
例 3
def swapPositions(list, pos1, pos2):
get = list[pos1], list[pos2]
list[pos2], list[pos1] = get
return list
List = [23, 65, 19, 90]
pos1, pos2 = 1, 3
print(swapPositions(List, pos1-1, pos2-1))
get = list[pos1], list[pos2]
list[pos2], list[pos1] = get
return list
List = [23, 65, 19, 90]
pos1, pos2 = 1, 3
print(swapPositions(List, pos1-1, pos2-1))
上記の例の出力結果は次のとおりです：
[19, 65, 23, 90]その他の拡張