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Mon Apr 25 16:38:49 CEST 2005 · https://mail.python.org/pipermail/python-dev/2005-April/052904.html

"Nick Coghlan" <ncoghlan at gmail.com> wrote in message 
news:426CB7C2.8030508 at gmail.com...
> Guido van Rossum wrote:
> > statement expansion", I think we can expect EXPR to produce a value
> > that is already an iterator (rather than merely an interable).
>
> Not supporting iterables makes it harder to write a class which is 
> inherently usable in a with block, though. The natural way to make 
> iterable classes is to use 'yield' in the definition of __iter__ - if 
> iter() is not called, then that trick can't be used.

Would not calling iter() (or .__iter__) explicitly, instead of depending on 
the implicit call of for loops, suffice to produce the needed iterator?

tjr

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[Python-Dev] Re: Re: anonymous blocks