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Mon Mar 22 19:33:36 EST 2004 · http://mail.python.org/pipermail/python-dev/2004-March/043400.html

> > IIRC, most people agreed on that iterables in the generator expression need
> > to be pre-computed (including myself). But there's a recent issue about
> > that.
> 
> If we're capturing the value of free variables, is there
> any need to pre-compute the iterators?

A free variable might be a function that itself references globals (or
at least nonlocals) that might change.

There is also the issue of exceptions: I'd expect exceptions in the
toplevel (first) iterable to be raised immediately, and not when the
first element of the iterator is requested.

--Guido van Rossum (home page: http://www.python.org/~guido/)

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Showing content from http://mail.python.org/pipermail/python-dev/2004-March/043400.html below:

[Python-Dev] An issue recently brought up in patch #872326 (generator expression)