#sum
Description: Get the sum.
def sum(iterable, /, start=0):
'''
Calculate the sum
:param iterable: an iterable object
:param start: initial value
:return: the sum
'''
Example:
print(sum([1,2,3,4,5,6,7,8,9]))
print(sum([1,2,3,4,5,6,7,8,9], 1000))