[Python-3000] PEP 3138- String representation in Python 3000

[Nick Coghlan]

M.-A. Lemburg wrote:
> I'll write up a PEP once we have a better understanding of the
> details, e.g. of how the codec type information should be
> defined...
> 
> Here's a straight-forward approach:
> 
> codecinfo.encode_type_combinations = [(bytes, bytes), (str, str)]
> codecinfo.decode_type_combinations = [(bytes, bytes), (str, str)]
> 
> for most codecs (e.g. utf-8, latin-1, cp850, etc.) this would
> then be:
> 
> codecinfo.encode_type_combinations = [(str, bytes)]
> codecinfo.decode_type_combinations = [(bytes, str)]

Do we need something that flexible? Would a simpler approach with 
separate "binary_transform" and "text_transform" flags be enough?

With the latter approach, the encode()/decode() methods could complain 
if either of the transform flags was set on the codec, while the 
transform()/untransform() methods could complain if the appropriate 
transform flag *wasn't* set.

Note also that both bytearray and bytes provide decode() methods, and 
will presumably provide transform() methods, so actual type annotations 
may not be the best way to go about this.

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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