Python将阿拉伯数字转换为罗马数字的方法

本文实例讲述了Python将阿拉伯数字转换为罗马数字的方法。分享给大家供大家参考。具体实现方法如下：

    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

希望本文所述对大家的Python程序设计有所帮助。