Terry J. Reedy <tjre...@udel.edu> added the comment: I think this should just be closed.
The original implied claim that 3.0 is not correct is not correct. The change of behavior is a clear side effect of and intended and documented change in the semantics of comprehensions. As near as I can tell, the results of the experiments are all correct according to the doc for yield. Python-list or the python-ideas list is more appropriate than the tracker to discuss a semantic change. In any case, comprehensions are function expressions, like lambda expressions, and expressions therein should act much the same as the expression in a lambda expression. Even if unclear, slightly insane, and not very useful, I do not think yield should be prohibited in generators expression because 1) it would introduce a back-incompatibility in 3.1; 2) it would slightly break the parallelism with other comprehensions; 3) it would slightly break the parallelism with the expanded for-form; 4) such use is unlikely in real practice; and 5) it would raise the question of where else to prohibit yield. ---------- nosy: +tjreedy _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue5577> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
