Python IRC Extended Color Code Gradient Rainbow Script

rainbow.py

#!/usr/bin/env python3

import random, itertools
from sys import argv

def main():
    num_color_hue, num_brightness, min_color, max_color = 12, 6, 16, 76
    color_hue, brightness = random.randint(0, num_color_hue - 1), random.randint(0, num_brightness - 1)
    direction1, direction2 = random.choice([ -1, 1 ]), random.choice([-1, 1])
    color = next(itertools.islice(range(min_color + color_hue, max_color + 1 + color_hue, num_color_hue),
                                  brightness, brightness + 1))
    if len(argv) < 2:
        return 1
    string, color_msg = ' '.join(argv[1:]), '\x02'
    for i in range(len(string)):
        if string[i] != ' ':
            color_msg += "\x03" + str(color) + string[i]
            color += direction1 * num_color_hue
            if color < min_color + color_hue:
                if color_hue == 0 and direction2 == -1:
                    color_hue = num_color_hue - 1
                    color = min_color + color_hue
                elif color_hue == num_color_hue - 1 and direction2 == 1:
                    color_hue = 0
                    color = min_color + color_hue
                else:
                    color_hue += direction2
                    color += num_color_hue + direction2
                direction1 = -direction1
            elif color > max_color + color_hue:
                if color_hue == num_color_hue - 1 and direction2 == 1:
                    color_hue = 0
                    color = max_color + color_hue
                elif color_hue == 0 and direction2 == -1:
                    color_hue == num_color_hue - 1
                    color = max_color + color_hue
                else:
                    color_hue += direction2
                    color += -num_color_hue + direction2
                direction1 = -direction1
        else:
            color_msg += ' '
    print(color_msg)

if __name__ == "__main__":
    main()