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Mon May 3 22:42:53 EDT 2004 · https://mail.python.org/pipermail/python-dev/2004-May/044652.html

On Mon, 2004-05-03 at 09:58, Jewett, Jim J wrote:
> Guido van Rossum:
> 
> > My counter to that is that *any* use of genexps where the consumer
> > doesn't consume (or discard) the iterator before the next line is
> > reached is extremely advanced use.
> 
> This might be worth putting in the PEP and the docs -- 

We are in rather dire need of docs and a revised PEP.

> Normal usage of a generator expression is to immediately consume 
> the entire sequence, or to discard the remainder.  
> 
> If portions of a generator *are* used later, programmers may need 
> some extra precautions to ensure that all names still have the 
> desired bindings.  

There may be a general rule that functions that make use of free
variables are best programmed in a functional style, where the function
doesn't depend on side-effects to those variables.

Jeremy

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Showing content from https://mail.python.org/pipermail/python-dev/2004-May/044652.html below:

[Python-Dev] PEP 289 - Generator Expressions