Please tell me what i did wrong

[gabejohnsonny21]

sample_list = [8, 2, 3, 0, 7]
print("Sample list: %s " % sample_list)

def sum_list(lists):
    for x in lists:
        total = total + lists[x]
    return total
    

print("Sum of all the number in the list: "),
print(sum_list(sample_list))

raw_input("\nPress ENTER to exit") 
 

I was told to create a function that can sum up all the elements in a list and this is what I came up with.
It didn't work
Please help