How Can I Use Sum() Function For A List In Python?

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 g

Solution 1:

The problem is that when you read from the input, you have a list of strings. You could do something like that as your second line:

numlist = [float(x) for x in numlist]

Solution 2:

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)
...

Solution 3:

You are adding up strings, not numbers, which is what your error message is saying.

Convert every string into its respective integer:

numlist = map(int, numlist)

And then take the average (note that I use float() differently than you do):

arithmetic_mean = float(sum(numlist)) / len(numlist)

You want to use float() before dividing, as float(1/2) = float(0) = 0.0, which isn't what you want.

An alternative would be to just make them all float in the first place:

numlist = map(float, numlist)

Solution 4:

Split returns you an array of strings, so you need to convert these to integers before using the sum function.

Solution 5:

You can try this.

reduce(lambda x,y:x+y, [float(x) for x in distance])