[Python-Dev] How to add an encoding alias?

[M.-A. Lemburg]

Guido van Rossum wrote:
>>Guido van Rossum wrote:
>>
>>>  import encodings.aliases
>>>  encodings.aliases.aliases['ansi-x3-4-1968'] = 'ascii'
>>
>>In order for the lookup to work, you have to replace hyphens
>>with underscores; see the top of aliases.py.
> 
> 
> Good catch!  Then my "fix" to aliases.py was also wrong.
> 
> Would it make sense to change the lookup function to convert *all*
> punctuation to underscores before doing the lookup?  (Then this one
> would actually have worked...)

Codecs must currently use names as defined by the search function in the
encodings package:

     Codec modules must have names corresponding to standard lower-case
     encoding names with hyphens mapped to underscores, e.g. 'utf-8' is
     implemented by the module 'utf_8.py'.

We could extend this to:

     Codec modules must have names corresponding to standard lower-case
     encoding names with all non-alphanumeric charactersmapped to
     underscores, e.g. 'utf-8' is implemented by the module 'utf_8.py'
     and 'ISO 639:1988' would be implemented as module 'iso_639_1988'.

Note that the aliasing dictionary is consulted *after*
having applied this mapping.

-- 
Marc-Andre Lemburg
CEO eGenix.com Software GmbH
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