Python 将列表中的指定位置的两个元素对调

      
    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)) 
以上实例输出结果为：

[19, 65, 23, 90]
实例 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)) 
以上实例输出结果为：

[19, 65, 23, 90]
实例 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)) 
以上实例输出结果为：

[19, 65, 23, 90]