Guido van Rossum <gu...@python.org> added the comment: No.
On Nov 25, 2017 18:01, "Nick Coghlan" <rep...@bugs.python.org> wrote: > > Nick Coghlan <ncogh...@gmail.com> added the comment: > > Serhiy's PR now implements the "Prohibit yield & yield from in generator > expressions and comprehensions" approach discussed on python-dev (currently > as a hard SyntaxError, but it could be amended to be a warning instead > without too much difficulty). > > The PR does highlight an interesting subtlety though: the easiest way to > implement this still allows yield expressions in the outermost iterator, > since that gets compiled in a different scope from the rest of the > comprehension body (it's evaluated eagerly and passed in to the implicit > nested function). > > I'm thinking we probably don't want to expose that detail to end users, > and will instead want to include a second check that prohibits yield > expressions in the outermost iterator as well. However, I'm not entirely > sure how we could implement such a check, short of adding a new "yield > expression prohibited" counter in the AST generation and/or symbol analysis > pass. > > ---------- > > _______________________________________ > Python tracker <rep...@bugs.python.org> > <https://bugs.python.org/issue10544> > _______________________________________ > ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue10544> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
