[Python-Dev] subclassing builtin data structures

[Ethan Furman]

On 02/12/2015 08:01 PM, Guido van Rossum wrote:
> On Thu, Feb 12, 2015 at 7:41 PM, Ethan Furman wrote:
>> 
>> 2) always use the type of self when creating new instances
>> 
>>        cons:
>>          - if constructor signatures change, must override all methods which
>>            create new objects
> 
> Con for #2 is a showstopper. Forget about it.

Happy to, but can you explain why requiring the programmer to override the necessary methods, or get tracebacks, is a
showstopper?  Is there a previous email thread I can read that discusses it?

--
~Ethan~

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