ratio-calc/ratio.py

#!/usr/bin/env python3

from sys import argv

def main():
    width = 0

    if (len(argv) > 1):
        try:
            width = int(argv[1])
        except ValueError as e:
            print('ValueError: Enter integer value!')
            exit(1)

        print('Width: {0}'.format(width))
        print(' 4x3 = {0}x{1}'.format(width, width * 3 / 4))
        print('16x9 = {0}x{1}'.format(width, width * 9 / 16))
    else:
        print('Enter width value!');

if __name__ == '__main__':
	main()