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//usr/lib/python2.4/site-packages/_xmlplus/xslt/Roman.py
""" Light-weight functions to convert from Roman-Numerals to ints, and vice-versa. """ import string factor_list = [1000, 500, 100, 50, 10, 5, 1] roman_equiv = {1000: 'M', 500: 'D', 100: 'C', 50: 'L', 10: 'X', 5: 'V', 1: 'I'} def IToRoman(num): roman = "" remainder = num factor_index = 0 for f in factor_list: factor_up = (f != 1000 and factor_list[factor_index - 1]) or None factor_down = (f != 1 and factor_list[factor_index + 1]) or None dividend = remainder / f remainder = remainder % f if factor_up and dividend == 4: roman = roman + roman_equiv[f] + roman_equiv[factor_up] elif factor_down and dividend == 1 and remainder / factor_down == 4: roman = roman + roman_equiv[factor_down] + roman_equiv[factor_up] remainder = remainder % factor_down else: roman = roman + roman_equiv[f]*dividend factor_index = factor_index + 1 return roman