[Python-Dev] PEP-393: request for keeping PyUnicode_EncodeDecimal()

["Martin v. Löwis"]

> the subject says it all. PyUnicode_EncodeDecimal() is listed among
> the deprecated functions.

Please see the section on deprecation. None of the deprecated functions
will be removed for a period of five years, and afterwards, they will
be kept until usage outside of the core is low. Most likely, this means
they will be kept until Python 4.

>   * It is not trivial to implement.
> 
>   * With the Unicode implementation constantly changing, it is nearly
>     impossible to know what input is currently regarded as a decimal
>     digit. See also:

I still recommend that you come up with your own implementation of that
algorithm. You probably don't need any of the error handler support,
which makes the largest portion of the code. Then, use
Py_UNICODE_TODECIMAL to process individual characters. It's a simple
loop over every character.

In addition, you could also take the same approach as decimal.py,
i.e. do

   self._int = str(int(intpart+fracpart))

This would improve compatibility with the decimal.py implementation,
which doesn't use PyUnicode_EncodeDecimal either (but instead goes
through _PyUnicode_TransformDecimalAndSpaceToASCII).

Regards,
Martin