Python实现把数字转换成中文

周末在家，写了个小程序，用于将阿拉伯数字转换化大写中文。程序没经过任何优化，出没经过详细的测试，挂到网上，方便将来有需要的时候直接拿来用。

#!/usr/bin/python/' target='_blank'>python#-*- encoding: utf-8 -*-import typesclass NotIntegerError(Exception):  passclass OutOfRangeError(Exception):  pass_MAPPING = (u'零', u'一', u'二', u'三', u'四', u'五', u'六', u'七', u'八', u'九', )_P0 = (u'', u'十', u'百', u'千', )_S4, _S8, _S16 = 10 ** 4 , 10 ** 8, 10 ** 16_MIN, _MAX = 0, 9999999999999999def _to_chinese4(num):  '''转换[0, 10000)之间的阿拉伯数字  '''  assert(0 <= num and num < _S4)  if num < 10:    return _MAPPING[num]  else:    lst = [ ]    while num >= 10:      lst.append(num % 10)      num = num / 10    lst.append(num)    c = len(lst)  # 位数    result = u''        for idx, val in enumerate(lst):      if val != 0:        result += _P0[idx] + _MAPPING[val]        if idx < c - 1 and lst[idx + 1] == 0:          result += u'零'        return result[::-1].replace(u'一十', u'十')    def _to_chinese8(num):  assert(num < _S8)  to4 = _to_chinese4  if num < _S4:    return to4(num)  else:    mod = _S4    high, low = num / mod, num % mod    if low == 0:      return to4(high) + u'万'    else:      if low < _S4 / 10:        return to4(high) + u'万零' + to4(low)      else:        return to4(high) + u'万' + to4(low)      def _to_chinese16(num):  assert(num < _S16)  to8 = _to_chinese8  mod = _S8  high, low = num / mod, num % mod  if low == 0:    return to8(high) + u'亿'  else:    if low < _S8 / 10:      return to8(high) + u'亿零' + to8(low)    else:      return to8(high) + u'亿' + to8(low)    def to_chinese(num):  if type(num) != types.IntType and type(num) != types.LongType:    raise NotIntegerError(u'%s is not a integer.' % num)  if num < _MIN or num > _MAX:    raise OutOfRangeError(u'%d out of range[%d, %d)' % (num, _MIN, _MAX))    if num < _S4:    return _to_chinese4(num)  elif num < _S8:    return _to_chinese8(num)  else:    return _to_chinese16(num)  if __name__ == '__main__':  print to_chinese(9000)