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

#-*- 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)