[Python-Dev] PEP 289 - Generator Expressions - Let's Move For ward

[Jewett, Jim J]

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 -- 

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.  

-jJ