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From: Peter Otten <__peter__@web.de>
Subject: Re: a gift function and a question
Date: Tue, 10 Sep 2013 09:46:44 +0200
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Xref: csiph.com comp.lang.python:53909

Mohsen Pahlevanzadeh wrote:

> I completed my two functions, i say may be poeple can use them:
> ######################################33
> def integerToPersian(number):
>     listedPersian = ['۰','۱','۲','۳','۴','۵','۶','۷','۸','۹']
>     listedEnglish = ['0','1','2','3','4','5','6','7','8','9']
>     returnList = list()
>            
>     for i in list(str(number)):
>         returnList.append(listedPersian[listedEnglish.index(i)])
> 
>     return ''.join(returnList)
> 
> def persianToInterger(persianNumber):
>     listedTmpString = list(persianNumber.decode("utf-8"))
>     returnList = list()
>     
>     for i in listedTmpString:
>         returnList.append(unicodedata.digit(i))
>         
>     return int (''.join(str(x) for x in returnList))

There is also the str.translate() method which takes a translation dict. 
Characters not in that dict will be left unaltered:

>>> persian = "۰۱۲۳۴۵۶۷۸۹"
>>> english = "0123456789"
>>> _p2e = str.maketrans(persian, english)
>>> _e2p = str.maketrans(english, persian)
>>> def persian_to_english(s): return s.translate(_p2e)
... 
>>> def english_to_persian(s): return s.translate(_e2p)
... 
>>> english_to_persian("alpha 12321 beta")
'alpha ۱۲۳۲۱ beta'
>>> persian_to_english(_)
'alpha 12321 beta'

[Advanced usage] If you prefer to get an error you can subclass dict:

>>> class NoDigitError(Exception):
...     pass
... 
>>> class StrictDict(dict):
...     def __missing__(self, key):
...             raise NoDigitError("Illegal codepoint #{}".format(key))
... 
>>> _e2p = StrictDict(str.maketrans(english, persian))
>>> english_to_persian("543")
'۵۴۳'
>>> english_to_persian("x543")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 1, in english_to_persian
  File "<stdin>", line 3, in __missing__
__main__.NoDigitError: Illegal codepoint #120