[Python-Dev] PEP 343 - next steps
barry at python.org
Sat Jun 11 23:43:43 CEST 2005
On Fri, 2005-06-10 at 16:23, Guido van Rossum wrote:
> While there's still some activity in the Wiki, nothing (to me) sounds
> like signs of serious disagreement or truly better alternatives. So I
> think I'd like to move forward towards acceptance soon (before
Well, I finally read PEP 343 in its entirety. Having not really had the
time to follow this thread, I have to say "well done". I like the PEP a
lot and can see many places in my own code where it would make things
I have one comment, and I may be too late or may be repeating other
suggestions (no, I haven't poured through the wiki page yet). I
actually don't think "with" reads as well and would propose "when". The
word I'd really like to use here is "while" but given that we already
have while loops and "as" is optional, I don't think that's a
possibility. If you made "as" required, it would be though, I think.
Look at the given examples:
with opening("/etc/passwd") as f:
when opening("/etc/passwd") as f:
with opening(filename, "w") as f:
print "Hello world"
when opening(filename, "w") as f:
print "Hello world"
> - throw() is a term taken from Java & C++. We can't call the method
> raise() -- but perhaps we can call it next_raising() or next_raise(),
> which emphasizes the similarity with next(). Thoughts? I'm not strong
> on this; I think throw() is fine too, especially since I expect that
> it will be used explicitly extremely rarely -- the only customer is
> the with_template decorator.
As others have mentioned "throw()" is fine.
> - Whether and how to keep a door open for a future extension to the
> syntax that allows multiple resources to be acquired in a single
> with-statement. Possible syntax could be
> (a) with EXPR1 [as VAR1], EXPR2 [as VAR2], EXPR3 [as VAR3], ...:
> (b) with EXPR1, EXPR2, EXPR3, ... as VAR1, VAR2, VAR3, ...:
I agree that (a) is better and feel +1 on keeping the door open to it.
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