我的代码不起作用？python 3

Question

n=int(input())
c={}
for i in range(n):
    name=str(input())
    c[name]=list(input().split())
print(c)
query=input()
query_scores=c[query]
print(sum(query_scores))

The sum function is not working. It shows:

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

Answer 1

From sum 's description:

Sums start and the items of an iterable from left to right and returns the total. start defaults to 0. The iterable's items are normally numbers, and the start value is not allowed to be a string.

Since the sum starts to 0 (by default), you need to cast the elements you want to sum to something that can be added to 0. strings cannot. You need to do something like this:

print(sum(int(x) for x in query_scores))

or, if you want to use floating numbers,

print(sum(float(x) for x in query_scores))

Answer 2

You have to convert the list items into any numeric type. The split function returns the string type and you are performing the sum in the str type

c[name]=list(input().split())

Can be changed into

c[name] = [ int(i) for i in input().split()]