how to calculate sum of a list in python

1# Python code to demonstrate the working of  
2# sum() 
3numbers = [1,2,3,4,5,1,4,5] 
4  
5# start parameter is not provided 
6Sum = sum(numbers) 
7print(Sum) # result is 25  
8# start = 10 
9Sum = sum(numbers, 10) 
10print(Sum) # result is 10 +25 = 35

1# to sum all the numbers we use python's sum() function
2a = [4,5,89,5,33,2244,56]
3a_total = sum(a)

1>>> list = [1, 2, 3]
2>>> sum(list)
36