总和函数prob TypeError：+不支持的操作数类型：'int'和'str'

Question

我是python（PYTHON 3.4.2）的新手，我正在尝试制作一个可进行加法和除法运算的程序，以查找用户输入的平均值或均值，但我不知道如何添加数字接收。

当我在命令提示符下打开程序时，它接受我输入的数字，并且如果我使用打印功能，也将打印它，但不会将数字加起来。

我收到此错误：

TypeError: unsupported operand type(s) for +: 'int' and 'str'

我的代码如下：

#Take the user's input
numbers = input("Enter your numbers followed by commas: ")
sum([numbers])

任何帮助将不胜感激。

Answer 1

input 将输入作为字符串

>>> numbers = input("Enter your numbers followed by commas: ")
Enter your numbers followed by commas: 1,2,5,8
>>> sum(map(int,numbers.split(',')))
16

您要告诉用户使用逗号分隔输入，因此需要用逗号分割字符串，然后将其转换为int然后求和

演示：

>>> numbers = input("Enter your numbers followed by commas: ")
Enter your numbers followed by commas: 1,3,5,6
>>> numbers
'1,3,5,6'   # you can see its string
# you need to split it
>>> numbers = numbers.split(',')
>>> numbers
['1', '3', '5', '6']
# now you need to convert each element to integer
>>> numbers = [ x for x in map(int,numbers) ]
or
# if you are confused with map function use this:
>>> numbers  = [ int(x) for x in numbers ]
>>> numbers
[1, 3, 5, 6]
#now you can use sum function
>>>sum(numbers)
15