TypeError: sequence item 0: expected str instance, int found - [python] list/str的互转问题

た入场券 2022-12-20 08:54 168阅读 0赞

# 报错 #

报错发生在list -> str的过程中,  
使用orderFood接收了用户输入的int值,

orderFood = list(map(int, input().split(',')))
    
    # list ->string
    orderFoodStr = ''.join(orderFood)
    print(orderFoodStr)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NoYXJvbm1vbW8_size_16_color_FFFFFF_t_70_pic_center]  
错报是因为join函数的对象应该是str而不能是int，需要借助map()函数将list内每个元素转为str型，再join().

orderFood = list(map(int, input().split(',')))
    
    # list ->string
    orderFoodStr = ','.join(map(str,orderFood))
    print(orderFoodStr)

![在这里插入图片描述][20201111180209309.png_pic_center]

# python - list/str 互转 #

list -> str

list1 = ['1','2','3']
    str1 = ''.join(list1)
    print(str1)
    
    
    list2 = [1,2,3]
    str2 = ''.join(map(str,list2))
    print(str2)

![在这里插入图片描述][20201112155051462.png_pic_center]str->list

str = "12345"
    li = list(str)
    print(li)
    
    li2 = list(map(int,str)) #转为int型
    print(li2)

![在这里插入图片描述][20201112155711528.png_pic_center]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NoYXJvbm1vbW8_size_16_color_FFFFFF_t_70_pic_center]: /images/20221120/752bcb6d429b42999889620d1404cc53.png
[20201111180209309.png_pic_center]: /images/20221120/de74b30909cf4015838f261d4e8292f8.png
[20201112155051462.png_pic_center]: https://img-blog.csdnimg.cn/20201112155051462.png#pic_center
[20201112155711528.png_pic_center]: https://img-blog.csdnimg.cn/20201112155711528.png#pic_center