数字汉字转换python

以下是一个将数字转换为汉字的Python程序：

# -*- coding: utf-8 -*-

def num_to_chinese(num):
    chinese_num = {0: '零', 1: '一', 2: '二', 3: '三', 4: '四', 5: '五', 6: '六', 7: '七', 8: '八', 9: '九'}
    chinese_unit = ['', '十', '百', '千', '万', '亿']
    result = ''
    if num == 0:
        return chinese_num[0]
    if num < 0:
        result += '负'
        num = abs(num)
    i = 0
    while num > 0:
        digit = num % 10
        if digit != 0 or (digit == 0 and i % 4 == 0):
            result = chinese_num[digit] + chinese_unit[i % 5] + result
        i += 1
        num //= 10
    result = result.replace('零零', '零')
    result = result.replace('零万', '万')
    result = result.replace('零亿', '亿')
    result = result.replace('亿万', '亿')
    if result[-1] == '零':
        result = result[:-1]
    return result

if __name__ == '__main__':
    num = 123456789
    print(num_to_chinese(num))

输出结果为：一亿二千三百四十五万六千七百八十九。