On 9/20/05, Terry Reedy <[EMAIL PROTECTED]> wrote: > "Guido van Rossum" <[EMAIL PROTECTED]> wrote in message > > and +1 on adding a conditional expression. I believe (y if x else z) > > was my favorite last time, wasn't it? > > No. That was your original proposal, which you later rejected.
Thanks for setting me straight; upon re-reading the PEP I couldn't even remember which one I favored at the time! > Your final 'favorite' was apparently (at the top) > > "Proposal > The proposed syntax is as follows: > (if <condition>: <expression1> else: <expression2>) " (+ elif parts) > > selected from > > "Summary of the Current State of the Discussion > Groups are falling into one of three camps: > 1. Adopt a ternary operator built using punctuation characters: > <condition> ? <expression1> : <expression2> > 2. Adopt a ternary operator built using new or existing keywords. > The leading examples are: > <condition> then <expression1> else <expression2> > (if <condition>: <expression1> else: <expression2>) > 3. Do nothing." > > Given the later addition of generator expressions with mandatory > parentheses , the mandatory-parentheses version of a conditional expression > looks less strange to me than it did then ;-). So I could happily use it > even though I may still lean toward the other option 2 version (then-else) > due to its not needing ':'s or a third elseif term for chaining. I think I'd prefer (if <expr> then <expr> else <expre>) i.e. no colons. None of the other expression forms (list comprehensions and generator expressions) involving statement keywords use colons. > *If* you want general community input, I would suggest a runoff ballot with > those four choices (and a summary of pros and cons of each), or fewer if > you see any as unacceptible. If there's one thing I've learned from the PEP 308 vote, it is that votes for language don't work. I prefer some discussion on Python-dev after which I pick one. -- --Guido van Rossum (home page: http://www.python.org/~guido/) _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
