Python converts Arabic numerals to Roman numerals, and python Arabic numerals

Python converts Arabic numerals to Roman numerals, and python Arabic numerals

This article describes how Python converts Arabic numerals to Roman numerals. Share it with you for your reference. The specific implementation method is as follows:

def numToRomanNum(Num): """digital will be converted into Roman numerals,Ex: numToRomanNum(3999)"""   if Num < 1 or Num > 3999:     print 'The Num must in 1-3999'   else:     NumDic = {       '1':('I','IV','V','IX'),       '2':('X','XL','L','XC'),       '3':('C','CD','D','CM'),       '4':('M')       }     items = sorted(NumDic.items())     retstr = ''     for item in items:       str = ''       (Num,modNum) = divmod(Num,10)       if modNum != 0:         if item[0] != '4':           if modNum <= 3:             while modNum > 0:               str = str.join(['',item[1][0]])               modNum -= 1           elif modNum < 5:             str = item[1][1]           elif modNum == 5:             str = item[1][2]           elif modNum < 9:             str = item[1][2]             while modNum > 5:               str = str.join(['',item[1][0]])               modNum -= 1           else:             str = item[1][3]         else:           while modNum > 0:             str = str.join(['',item[1][0]])             modNum -= 1         retstr = str.join(['',retstr])     return retstr

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