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Thu Sep 22 07:12:10 CEST 2005 · https://mail.python.org/pipermail/python-dev/2005-September/056654.html

[Guido]
> I strongly feel that this needs to be corrected in 2.5.  Iterators
> should have neither __len__ nor __nonzero__. 

Right.  I'll get it fixed-up.

[Terry Reedy]
> I presume there were two reasons: internal efficiency of 
> preallocations
> (list(some_it) for example)

[Guido]
> This could have been implemented without making the 
> implementation details public.

I see a way to do that by renaming the __len__ method to some private
name for internal use.  This would preserve the performance gains while
still restoring the public API.

Raymond

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[Python-Dev] bool(iter([])) changed between 2.3 and 2.4