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
#-*- encoding: utf-8 -*-

import types

class NotIntegerError(Exception):
  pass

class 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, 9999999999999999

def _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)