sum(a)
a is the list , it adds up all the numbers in the
list a and takes start to be 0, so returning
only the sum of the numbers in the list.
sum(a, start)
this returns the sum of the list + start
// Python code to demonstrate the working of
// sum()
numbers = [1,2,3,4,5,1,4,5]
// start parameter is not provided
Sum = sum(numbers)
print(Sum)
// start = 10
Sum = sum(numbers, 10)
print(Sum)