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[Python-Dev] PEP 3147

Barry Warsaw barry at python.org
Sun Apr 11 19:36:19 CEST 2010 
On Apr 11, 2010, at 02:39 AM, Nick Coghlan wrote:

>Barry Warsaw wrote:
>> I don't have strong feelings about this.  I thought it would be handy for
>> future Python's to have access to this, but then, without access to previous
>> version magic numbers, it probably doesn't help much.  And as you say, CPython
>> won't know about alternative implementation's tags.
>> 
>> So I'm willing to call YAGNI on it and just expose the current Python's magic
>> tag.  While we're at it, how about making both the tag and the number
>> attributes of the imp module, instead of functions like .get_magic()?  Of
>> course we'd keep the latter for backward compatibility.
>
>I think one of the virtues of the functions is making it bleedingly
>obvious to all concerned that these are read only values.
>
>So +1 to only exposing the current version of the implementation tag and
>magic number, and +0 to doing so via attributes rather than functions.
>
>(I'm still in favour of keeping the list of old tags and magic numbers
>in a source comment though - commenting them out rather than deleting
>them when updating them isn't a major hassle).

Thinking about this more, I've decided to add imp.get_tag() and remove
imp.magic_tags.  This avoids changes to the existing API, and just adds to it
in a more consistent way.

-Barry

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