convert rgb to hex from cli

rgb2hex.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

def main(rgb):
    if len(rgb) != 3 and len(rgb) != 4:
        from sys import stderr, exit
        stderr.write('expected either "r g b" or (r,g,b) as input\n')
        exit(2)
    print("#"+("{:02x}"*3).format(*rgb[:3]))

if __name__ == '__main__':
    from sys import argv
    if argv[1] in ('--help', '-h'):
        from sys import exit
        print('RGB 2 HEX!')
        print('~~~~~~~~~~')
        print('A quick fix cli tool for converting RGB to HEX')
        print('    usage: python3 rgb2hex.py [R] [G] [B]')
        print('           python3 rgb2hex.py ([R] [G] [B])')
        print('           python3 rgb2hex.py \'[R],[G],[B]\'')
        print('           python3 rgb2hex.py \'([R],[G],[B])\'')
        print()
        print('    notes: there should be only either 1 or 3 inputs')
        print('           if there is a fourth number, this is ignored')
        print('               (useful if there is alpha')
        print('           [R], [G], and [B] above represent base 10 numbers')
        exit(0)
    if len(argv) != 2 and len(argv) != 4:
        from sys import stderr, exit
        stderr.write('expected either 1 or 3 args\n')
        exit(1)
    try:
        main(tuple(map(lambda s : max(0, min(255, int(s.strip().rstrip(',')))), ','.join(map(lambda s : s.rstrip(','), argv[1:])).strip('()').split(","))))
    except ValueError:
        from sys import stderr, exit
        stderr.write('invalid -- accepted inputs: (r g b) and (r,g,b).\n')
        stderr.write('Parens optional and r,g,b must each be base 10 numbers\n')
        exit(3)