[Python-Dev] Tricky way of of creating a generator via a comprehension expression (original) (raw)
Ivan Levkivskyi levkivskyi at gmail.com
Thu Nov 23 06:38:31 EST 2017
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On 23 November 2017 at 11:55, Nick Coghlan <ncoghlan at gmail.com> wrote:
On 23 November 2017 at 18:11, Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
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. People keep saying this, but seriously, those semantics aren't clear at all once you actually start trying to implement it. If Serhiy will implement his idea (emitting for-loop bytecode inside a try-finally), then I see no problems accepting it as a fix.
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