number_factoring.py

number_factoring.py

#!/usr/bin/env python3
#
# Take a user provided integer and find all of the possible factors for that number.
#
# Notes:
#   Does not find the factors of negative numbers.
#
# Version: v1.1.3
# License: MIT License
#          Copyright (c) 2020-2021 Hunter T. (StrangeRanger)
#
########################################################################################


def finding(x):
    """Finds and displays all factors of a given integer in a paired format.

    Args:
        x (int): The integer for which factors are to be calculated.
    """
    factors = []
    i = 0

    while i < x:
        i += 1
        if x % i == 0:
            factors.append(i)

    first = 0
    last = len(factors) - 1
    even_odd = len(factors) % 2

    if even_odd == 1:
        factor_length = int(len(factors) / 2 + 1)
    else:
        factor_length = int(len(factors) / 2)

    ## Print the corresponding factors side by side.
    for i in range(factor_length):
        print("{}*{}".format(factors[first], factors[last]))
        first += 1
        last -= 1

    print("\nA total of {} factors of {}".format(len(factors), num))


## Make sure that user input is valid and that any ValueErrors are caught.
while True:
    try:
        num = int(input("Enter a number: "))
    except ValueError:
        print("Invalid input: only numbers are accepted as input\n")
        continue

    if num < 0:
        print("Invalid input: only positive numbers are accepted as input\n")
        continue
    break

print("\nFactors of {} are: ".format(num))
finding(num)