Pythonはデジタルを中国語に変換

週末は家で、アラビア数字を大文字の中国語に変換するための小さなプログラムを書いた.プログラムはいかなる最適化を経ていないで、出没して詳しいテストを経て、ネット上に掛けて、将来必要な時に直接持ってくるのが便利です.

#!/usr/bin/python
#-*- encoding: utf-8 -*-

import types

class NotIntegerError(Exception):
  pass

class OutOfRangeError(Exception):
  pass

_MAPPING = (u' ', u' ', u' ', u' ', u' ', u' ', u' ', u' ', u' ', u' ', )
_P0 = (u'', u' ', u' ', u' ', )
_S4, _S8, _S16 = 10 ** 4 , 10 ** 8, 10 ** 16
_MIN, _MAX = 0, 9999999999999999

def _to_chinese4(num):
  ''' [0, 10000) 
  '''
  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)  #  
    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' '
    
    return result[::-1].replace(u' ', u' ')
    
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' '
    else:
      if low < _S4 / 10:
        return to4(high) + u' ' + to4(low)
      else:
        return to4(high) + u' ' + 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' '
  else:
    if low < _S8 / 10:
      return to8(high) + u' ' + to8(low)
    else:
      return to8(high) + u' ' + 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)