[Python-3000] Discussions with no PEPs

[Barry Warsaw]

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On Mar 12, 2007, at 1:02 PM, Thomas Wouters wrote:

>  - Mixing interface-definition and implementation like that makes  
> it hard for new programmers to pick up the difference. It will be  
> harder to explain the difference between 'dict' and 'Mapping' when  
> they are both in the list of bases. How can you tell one from the  
> other?

I'm in agreement with everything Thomas said here, but I think this  
is one of the most important points.  If you're looking at a class  
definition, it really should be plainly obvious what contributions to  
implementation and what contributes to interface declarations,  
without having to traipse through a bunch of documentation or source  
code.  I think separating implementation and interface declarations  
aids in readability and discoverability.

- -Barry

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