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：
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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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希望本文所述对大家的Python程序设计有所帮助。