Python 將列表中的指定位置的兩個元素對調
定義一個列表,並將列表中的指定位置的兩個元素對調。
例如,對調第一個和第三個元素:
對調前 : List = [23, 65, 19, 90], pos1 = 1, pos2 = 3 對調後 : [19, 65, 23, 90]
實例 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))
以上實例輸出結果為:
[19, 65, 23, 90]
實例 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))
以上實例輸出結果為:
[19, 65, 23, 90]
實例 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))
以上實例輸出結果為:
[19, 65, 23, 90]