sum (snippet)

Python example 'sum'

Functions in program:

• def sum_ar(ar, end_i):
• def sum_(*args):

sum

Python beginners example: sum

#!/usr/bin/python
# -*- coding: utf-8 -*-

# Sudo ALgorithm:
# both functions work on same principle
# Iterate through array/arguments
# add each element to variable(res)
# return sum

def sum_(*args):
    res = 0.0
    for arg in args:
        res += arg
    return res

def sum_ar(ar, end_i):
    # end_i is the last index of array
    # till which function should add
    # array's elements
    if end_i > 0 and end_i <= len(ar):
        if end_i == len(ar):
            end_i = end_i - 1
    else:
        end_i = len(ar) - 1

    res = 0.0
    for elem in ar[:end_i + 1]:
        res += elem 

    return res 

# Simple Algorithm

# Testing
# First Function
if sum_(1, 2, 3, 4, 5, 6, 7, 8, 9) == 45:
    print("First Function Works!")

# Second Function
if sum_ar([1, 2, 3, 4, 5, 6, 7, 8, 9], -1) == 45:
    print("Second Function Partially Works!")

if sum_ar([1, 2, 3, 4, 5, 6, 7, 8, 9], 6) == 28:
    print("Second Function Completely Works!")

Useful links

• Learn Python: https://pythonbasics.org
• Download Python: https://python.org