如何交換Python中的列表中的2個項目？

Question

def swap_name(name_list): 
""" (list of str) -> NoneType 

Modify name_list so that the first name and last name are swapped. 

>>> name = ['Tommy', 'Jason'] 
>>> swap_name(name) 
>>> name 
['Jason', 'Tommy'] 

""" 
# My Answer which is not complete and i don't know how to complete it or how to correct it. I tried in every way but it didn't work...I need your help 

for i in range (len (name_list)): 
    name_list[i] = [name_list[1] , name_list[0]] 

Answer 1

正如其他人所說，你可以這樣做：

name_list.reverse() 

如果這是家庭作業，你通常希望更多像這樣的（否則，這將是使用python標準方法的鍛鍊展示一些東西，而不是理解交換算法）：

temp = name_list[0] 
name_list[0] = name_list[1] 
name_list[1] = temp 

但是，這些都是依賴於您的列表只有其中2項。你的for循環讓我感覺你的數據結構比這更復雜。你能向我們展示一些示例輸入和輸出嗎？

Answer 2

在Python中，你可以交換元素與一個表達：left, right = right, left

>>> name = ['Tommy', 'Jason'] 
>>> name[0], name[1] = name[1], name[0] 
>>> name 
['Jason', 'Tommy']