089.py

# answer is 743
# timed ~ 0.16 seconds

def convert(x):
	## roman to decimal
	conversionTable = {"I": 1, "V": 5, "X": 10, "L": 50, "C": 100, "D": 500, "M": 1000}
	if type(x) == list or type(x) == str: return [conversionTable[a.upper()] for a in x if a.upper() in conversionTable]

	## decimal to roman
	irregulars = {"IV": 4, "VI": 6, "VII": 7, "VIII": 8, "IX": 9, "XL": 40, "LX": 60, "LXX": 70, "LXXX": 80, "XC": 90, "CD": 400, "DC": 600, "DCC": 700, "DCCC": 800, "CM": 900}
	conversionTable.update(irregulars)
	if type(x) == int:	return {b:a for a, b in conversionTable.items()} ## switch keys and values

def rn(input):
	input = str(input) ## make iterable
	if input.isdigit():	## decimal to roman
		value = ""
		digits = [(eval(z + "".join(["0" for x in range(len(input[id:])-1)]))) for id, z in enumerate(input)]
		for i in digits:
			if i in convert(i): value += convert(i)[i]
			elif i/2 in convert(i) and i % 2 == 0: value += convert(i)[i/2]*2
			elif i/3 in convert(i) and i % 3 == 0: value += convert(i)[i/3]*3
			elif i/4 in convert(i) and i % 4 == 0: value += convert(i)[i/4]*4
		return value
	else: ## roman to decimal
		in_roman = convert(input)[::-1] ## reverse to combat the subtration priciple
		value = in_roman[0] if len(in_roman) > 0 else 0;
		while len(in_roman) > 1:
			a, b = in_roman[0:2]
			if a < b or a == b: value += b ## add if small to big
			elif a > b: value -= b ## subtract if big to small
			del in_roman[0] ## on to the next one
		return value

def main():
	with open("extras/roman.txt", "r") as f:
		original_content = [x.strip('\n') for x in f.readlines()]
		new_content = [rn(rn(x)) for x in original_content]
		original_length = 0
		new_length = 0
		for x in original_content: original_length += len(x)
		for x in new_content: new_length += len(x)
		return original_length - new_length

print main()