On 2018年07月04日 00:25, Nathaniel Smith wrote:
The only cases that seem potentially valuable to me are the ones that are literally the form 'if <name> := <expr>` and 'while <name> := <expr>'. (I suspect these are the only cases that I would allow in code that I maintain.) The PEP does briefly discuss the alternative proposal of restricting to just these two cases, but rejects it because it would rule out code like 'if (<name> := <expr>) <comparison> <expr>'. But those are exactly the cases that I want to rule out, so that seems like a plus to me :-). The 'if <expr> as <name>' syntax would be a simple way to encode exactly these simple non-harmful cases. The PEP rejects it on the grounds that 'as' is already used in a different way by 'except' and 'with'. But... 'as' is *also* used in the *same* way by 'import', so the argument feels disingenuous. Yeah, there'd be an inconsistency, but that inconsistency already exists, and adding 'if ... as' and 'while ... as' wouldn't create any *new* inconsistencies.
Agreed, tried to make this point in several threads. -Mike _______________________________________________ Python-Dev mailing list [email protected] https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com