问题
I'm new to python (PYTHON 3.4.2) and I'm trying to make a program that adds and divides to find the average or the mean of a user's input, but I can't figure out how to add the numbers I receive.
When I open the program at the command prompt it accepts the numbers I input and would print it also if I use a print function, but it will not sum the numbers up.
I receive this error:
TypeError: unsupported operand type(s) for +: 'int' and 'str'
My code is below:
#Take the user's input
numbers = input("Enter your numbers followed by commas: ")
sum([numbers])
Any help would be deeply appreciated.
回答1:
input takes a input as string
>>> numbers = input("Enter your numbers followed by commas: ")
Enter your numbers followed by commas: 1,2,5,8
>>> sum(map(int,numbers.split(',')))
16
you are telling user to give input saperated by comma, so you need to split the string with comma, then convert them to int then sum it
demo:
>>> 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
回答2:
input will give you string, and you are trying to concat string with int.
回答3:
First you need to convert elements of "numbers" to int, no need to strip the comma or whitespaces. This code is pretty straight forward and works fine.
numbers = input("Enter your numbers followed by commas: ")
numbers_int = [int(x) for x in numbers]
numbers_sum = sum(numbers_int)
print numbers_sum
回答4:
Try the following code. It works for me. Actually input() tries to run the input as a Python expression. But the raw_input() takes the input as string. input() exists in Python 3.x.You can find more details here
numbers = input("Enter your numbers followed by commas: ") ## takes numbers as input as expression
print sum([i for i in numbers]) ## list comprehension to convert the numbers into invisible list. This is done because `sum()` runs only on iterable and list is iterable.
Output:
Enter your numbers followed by commas: 1,2,3,4
10
回答5:
Simple: the list elements are stored as string :) So you have to convert all of them to int
来源：https://stackoverflow.com/questions/26923445/sum-function-prob-typeerror-unsupported-operand-types-for-int-and-str