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。