Python实现阿拉伯数字转汉语数字(范围：亿)

环境：win10+Python3　　实现：亿范围内正整数阿拉伯数字转汉语数字(未做健壮性判断)

import re


num_dict = {'1':'一', '2':'二', '3':'三', '4':'四', '5':'五', '6':'六', '7':'七', '8':'八', '9':'九', '0':'零', }
index_dict = {1:'', 2:'十', 3:'百', 4:'千', 5:'万', 6:'十', 7:'百', 8:'千', 9:'亿'}
while True:
    num = input(">>")

    nums = list(num)
    nums_index = [x for x in range(1, len(nums)+1)][-1::-1]

    str = ''
    for index, item in enumerate(nums):
        str = "".join((str, num_dict[item], index_dict[nums_index[index]]))

    str = re.sub("零[十百千零]*", "零", str)
    str = re.sub("零万", "万", str)
    str = re.sub("亿万", "亿零", str)
    str = re.sub("零零", "零", str)
    str = re.sub("零\\b" , "", str)
    print(str)

运行示例：