[Python-Dev] Tricky way of of creating a generator via a comprehension expression (original) (raw)
Greg Ewing greg.ewing at canterbury.ac.nz
Thu Nov 23 03:11:37 EST 2017
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Ivan Levkivskyi wrote:
"People sometimes want to refactor for-loops containing
yieldinto a comprehension but that doesn't work (particularly because of the hidden function scope) - lets make it a SyntaxError"
Personally I'd be fine with removing the implicit function scope from comprehensions and allowing yield in them, since the semantics of that are clear.
But I don't see a way to do anything equivalent with generator expressions. Since the current effect of yield in a generator expression is pretty useless, it seems best just to disallow it.
That means a list comprehension won't be equivalent to list(generator_expression) in all cases, but I don't think there's any great need for it to be.
-- Greg
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