[Python-Dev] Tricky way of of creating a generator via a comprehension expression (original) (raw)
Guido van Rossum guido at python.org
Wed Nov 22 14:15:34 EST 2017
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On Wed, Nov 22, 2017 at 11:08 AM, Ivan Levkivskyi <levkivskyi at gmail.com> wrote:
On 22 November 2017 at 19:54, Jelle Zijlstra <jelle.zijlstra at gmail.com> wrote:
One proposal is to make it so
ggets assigned a list, and theyieldhappens in the enclosing scope (so the enclosing function would have to be a generator). This was the way things worked in Python 2, I believe. Another proposal is to make this code a syntax error, because it's confusing either way. (For what it's worth, that would be my preference.) Concerning this two options it looks like me and Serhiy like the first one, Paul is undecided (), and Antoine is in favor of option 2.
While that may be the right thing to do, it's a silent change in semantics, which I find pretty disturbing -- how would people debug such a failure? That's why I think we should deprecate or hard break it for at least one release.
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