Python不总结列表

Question

I cannot get python to sum a list. No matter what I try, I cannot get the following code to run. Can someone please help me?

A = []
while 1<2:
    i = input("Enter a number")
    if int(i) == -1:
        s = sum(A)
        print(s)
        break
    elif int(i) != -1: 
        A.append(i)

Answer 1

Python 3.x
input "i" needs to be converted to an int before adding to list "A"

A =[]
while 1<2:
    i=int(input("Enter a number"))
    if i==-1:
        s=sum(A)
        print(s)
        break
    elif i!=-1: A.append(i)

Python 2.x

No need to convert input to an int.

A =[]
while 1<2:
i=(input("Enter a number"))
if i==-1:
    print(type(A))
    s=sum(A)
    print(s)
    break
elif i!=-1: A.append(i)