Ivan Pozdeev via Python-Dev wrote:
This isn't as messy as you make it sound if you remember that the
outermost iterable is evaluated only once at the start and all the
others -- each iteration.
Anyone using comprehensions has to know this fact.
That fact alone doesn't imply anthing about the *scopes* in which
those iterators are evaluated, however.
Currently the only situation where the scoping makes a difference
is a generator expression that isn't immediately used, and you can
get a long way into your Python career without ever encountering
that case.
--
Greg
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