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Fri Oct 7 16:21:37 CEST 2005 · https://mail.python.org/pipermail/python-dev/2005-October/057052.html

Nick Coghlan wrote:
> Eric Nieuwland wrote:
>> What happens to
>>
>>     with 40*13+2 as X:
>>         print X
>
> It would fail with a TypeError because the relevant slot in the type 
> object
> was NULL - the TypeError checks aren't shown for simplicity's sake.
>
> This behaviour isn't really any different from the existing PEP 343 - 
> the only
> difference is that the statement looks for a __with__ slot on the 
> original
> EXPR, rather than looking directly for an __enter__ slot.

Hmmm I hadn't noticed that.
In my memory a partial implementation of the protocol was possible.
Thus, __enter__/__exit__ would only be called if they exist.

Oh well, I'll just add some empty methods.

--eric

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[Python-Dev] Proposed changes to PEP 343