import re subnums = [ ('cd',4*'c'), ('xl',4*'x'), ('iv',4*'i'), ('d',5*'c'), ('l',5*'x'), ('v',5*'i'), ('cm',9*'c'), ('xc',9*'x'), ('ix',9*'i')] nums = [ ('m',1000), ('c',100), ('x', 10), ('i',1) ] def cal(x): for (s, l) in subnums: x = x.replace(s, l) x = '+'.join(list(x)) for (c, w) in nums: x = x.replace(c, str(w)) if x == '': x = '0' return eval(x) def ask(): roman = raw_input('Input the Roman Number: ').lower() if (re.search("^m*?(d|cm|cd)?c*?(l|xc|xl)?x*?(ix|v|iv)?(i{1,3})?$",roman)): print " The Roman number %s is actually %s" % (roman.upper(), cal(roman)) else: print " This is definately not a Roman Number." print " Please pay attention." ask() ask()
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