Numerals to Roman Numerals

roman_numerals_up_to_1k.py

MAPPING = [None]
RAW = ['I', 'V', 'X', 'L', 'C', 'D', 'M']
n = 0
last = ''
places = [1, 2, 3]
for place in places:
	MAPPING.append(dict())
	SET = RAW[(place-1)*2: ((place-1)*2)+3]
	for i in range(1, 10):
		if i < 4:
			MAPPING[place][str(i)] = SET[0]*i
		elif i == 4:
			MAPPING[place][str(i)] = SET[0]+SET[1]
		elif i == 5:
			MAPPING[place][str(i)] = SET[1]
		elif i < 9:
			MAPPING[place][str(i)] = SET[1]+(SET[0]*(i-5))
		else:
			MAPPING[place][str(i)] = SET[0]+SET[2]

MAPPING.append({"1": "M"})

def convert(s):
	i = len(s)
	ret = ""
	for c in s:
		ret += MAPPING[i][c]
		i -= 1
	return ret