def getRomanNum(RomanStr):
# 玩蛇网
"""Roman numerals will be converted into digital,RomanStr is a RomanString"""
import re
if re.search('^M{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$',RomanStr)!=None:
NumDic = {"pattern":"","retNum":0}
RomanPattern = {
"0":('','','','M'),
"1":('CM','CD','D','C',100),
"2":('XC','XL','L','X',10),
"3":('IX','IV','V','I',1)
}
i = 3
NumItems = sorted(RomanPattern.items())
for RomanItem in NumItems:
if RomanItem[0] != '0':
patstr = NumDic["pattern"].join(['',RomanItem[1][0]])
if re.search(patstr,RomanStr) != None:
NumDic["retNum"] += 9*RomanItem[1][4]
NumDic["pattern"] = patstr
else:
patstr = NumDic["pattern"].join(['',RomanItem[1][1]])
if re.search(patstr,RomanStr) != None:
NumDic["retNum"] += 4*RomanItem[1][4]
NumDic["pattern"] = patstr
else:
patstr = NumDic["pattern"].join(['',RomanItem[1][2]])
if re.search(patstr,RomanStr) != None:
NumDic["retNum"] += 5*RomanItem[1][4]
NumDic["pattern"] = patstr
if NumDic["pattern"] == '':
NumDic["pattern"] = '^'
tempstr = ''
sum = 0
for k in range(0,4):
pstr = RomanItem[1][3].join(['','{']).join(['',str(k)]).join(['','}'])
patstr = NumDic["pattern"].join(['',pstr])
if re.search(patstr,RomanStr) != None:
sum = k*(10**i)
tempstr = patstr
if tempstr <> '':
NumDic["pattern"] = tempstr
else:
NumDic["pattern"] = patstr
NumDic['retNum'] += sum
i -= 1
return NumDic['retNum']
else:
print 'String is not a valid Roman numerals'
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