[Python-Dev] Proposal: defaultdict

Steve Holden steve at holdenweb.com
Sun Feb 19 04:57:35 CET 2006

Martin v. Löwis wrote:
> Adam Olsen wrote:
>>Still -1.  It's better, but it violates the principle of encapsulation
>>by mixing how-you-use-it state with what-it-stores state.  In doing
>>that it has the potential to break an API documented as accepting a
>>dict.  Code that expects d[key] to raise an exception (and catches the
>>resulting KeyError) will now silently "succeed".
> Of course it will, and without quotes. That's the whole point.
>>I believe that necessitates a PEP to document it.
> You are missing the rationale of the PEP process. The point is
> *not* documentation. The point of the PEP process is to channel
> and collect discussion, so that the BDFL can make a decision.
> The BDFL is not bound at all to the PEP process.
> To document things, we use (or should use) documentation.
One could wish this ideal had been the case for the import extensions 
defined in PEP 302.

Steve Holden       +44 150 684 7255  +1 800 494 3119
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