[Python-Dev] draft pep: backwards compatibility

[Michael Foord]

Antoine Pitrou wrote:
> <glyph <at> divmod.com> writes:
>   
>> This is a false dichotomy; for core developers, the list needs to be 
>> exhaustive.  Everything that can change needs to be described as either 
>> compatible or incompatible.
>>     
>
> How do you enumerate "everything that can change"? It does not look like a
> finite set to me (but perhaps I'm wrong); and certainly not like a set of a size
> reasonable enough to be enumerated in a human-readable way :)
>
>   

And this is why expressing a finite list of things we guarantee won't 
change is a virtually impossible task - unless one of you is 
volunteering to write an official spec for Python and its libraries... 
:-) (Something that would not be bad IMO - just a long and difficult 
task, *especially* if you include the library along with language 
semantics and APIs).

Michael

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