expand_eightbit

#! /usr/bin/env python3

import sys, re
from os.path import basename

COLOR_CHUNKS = [40 * j + (55 * (j > 0)) for j in range(6)]
MONOTONE_CHUNKS = [10 * i + 8 for i in range(24)]
COLORS = [(i, j, k) for i in COLOR_CHUNKS for j in COLOR_CHUNKS for k in COLOR_CHUNKS]
MONOTONES = [(i, i, i) for i in MONOTONE_CHUNKS]
NUMERAL_BASE = 16
START_OF_COLORS = 16
START_OF_MONOTONES = 232
END_OF_MONOTONES = 255

def expand_value(match_obj):
    color = int(match_obj.group(0))
    if color >= START_OF_COLORS and color <= END_OF_MONOTONES:
        if color < START_OF_MONOTONES:
            idx = color - START_OF_COLORS
            html = COLORS[idx]
        else:
            idx = color - START_OF_MONOTONES
            html = MONOTONES[idx]
        html_components = ['%02x' % c for c in html]
        html_code = ('#%s' % (''.join(html_components))).upper()
        return html_code
    return match_obj.group(0)

for line in sys.stdin:
    sline = re.sub('(?<=\s)\d+', expand_value, line)
    print(sline, end='')