How can I use sum() function for a list in Python?

Question

I am doing my homework and it requirers me to use a sum () and len () functions to find the mean of an input number list, when I tried to use sum () to get the sum of the list, I got an error TypeError: unsupported operand type(s) for +: 'int' and 'str'. Following is my code:

numlist = input("Enter a list of number separated by commas: ")

numlist = numlist.split(",")

s = sum(numlist)
l = len(numlist)
m = float(s/l)
print("mean:",m)

Answer 1

The problem is that you have a list of strings. You need to convert them to integers before you compute the sum. For example:

numlist = numlist.split(",")
numlist = map(int, numlist)
s = sum(numlist)
...