[Guido] > ... > BTW, while Alex has shown that a generator function with no free > variables runs quite fast, a generator expression that uses variables > from the surrounding scope will have to use the nested scopes > machinery to access those, unlike a list comprehension; not only does > this run slower, but it also slows down all other uses of that > variable in the surrounding scope (because it becomes a "cell" > throughout the scope). The implementation could synthesize a generator function abusing default arguments to give the generator's frame locals with the same names.
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