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import roman
nMaxLimit = 3999
def GetRomanArithOper (strInput):
global nMaxLimit
arrElem = strInput.split()
nInt_01 = roman.fromRoman(arrElem[0])
strOperator = arrElem[1]
nInt_02 = roman.fromRoman(arrElem[2])
if strOperator == "+":
if nInt_01 + nInt_02 > nMaxLimit:
return "non potest"
return roman.toRoman(nInt_01 + nInt_02)
if strOperator == "-":
if nInt_01 > nInt_02:
return roman.toRoman(nInt_01 - nInt_02)
if nInt_01 == nInt_02:
return "nulla"
return "non potest"
if strOperator == "/":
if nInt_01 % nInt_02 == 0:
return roman.toRoman(int(nInt_01 / nInt_02))
return "non potest"
if strOperator == "*":
if nInt_01 * nInt_02 > nMaxLimit:
return "non potest"
return roman.toRoman(nInt_01 * nInt_02)
if strOperator == "**":
if nInt_01 ** nInt_02 > nMaxLimit:
return "non potest"
return roman.toRoman(nInt_01 ** nInt_02)
## strGivenExpr = "IV + V"
## strGivenExpr = "M - I"
## strGivenExpr = "X / II"
## strGivenExpr = "XI * VI"
## strGivenExpr = "VII ** III"
## strGivenExpr = "V - V"
## strGivenExpr = "V / II"
## strGivenExpr = "MMM + M"
strGivenExpr = "V - X"
print (GetRomanArithOper(strGivenExpr))
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