How to write a program in python to get a user input list and sum all the items in it

Question

I'm new to python programming and I want to know how to write a python program to get a some user input integers as a list and add all the items in it.This is the code I've written..

A=list(input("Enter the values of the list "))  
total=0  
for a in A:    
    total=total+a  
print(total)

When I run this program it says,

Traceback (most recent call last):
  File "C:/Users/Jayaweera/Desktop/Python programming/51E5-sum all the items in a list.py", line 4, in <module>
    total=total+a
TypeError: unsupported operand type(s) for +: 'int' and 'str'

Mandatory readings: How to Ask, minimal reproducible example, How do I ask and answer homework questions? — Łukasz Rogalski
– Łukasz Rogalski, Commented Jan 24, 2017 at 14:09
Possible duplicate of How can I read inputs as integers in Python? — OneCricketeer
– OneCricketeer, Commented Jan 24, 2017 at 14:10

Gustavo Gomes · Accepted Answer · 2017-02-07 21:51:21Z

0

Try this modification, input will always return a string and you can't sum a string with an integer in python.

A=list(input("Enter the values of the list "))  
total=0  
for a in A:    
    total=total+int(a)  
print(total)

Another thing is that first line, do you know how many values the list will have? If so why won't replace your first line with:

A = list()
totalElementsOfList = 100 # assuming it is for example 100 elements
for iteration in range(100):
    A.append(input("Value #" + str(iteration) + " :"))

for element in A:
    total += int(element)

print(total)

answered Feb 7, 2017 at 21:51

Gustavo Gomes

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