On Thu, 01 May 2008 08:58:22 -0700, Guido van Rossum wrote: > On Thu, May 1, 2008 at 3:20 AM, Nick Coghlan <[EMAIL PROTECTED]> wrote: >> I think Giovanni's point is an important one as well - with an >> iterator, >> you can pipeline your operations far more efficiently, since you don't >> have to wait for the whole directory listing before doing anything >> (e.g. if you're doing some kind of move/rename operation on a >> directory, you can start copying the first file to its new location >> without having to wait for the directory read to finish). >> >> Reducing the startup delays of an operation can be a very useful thing >> when >> it comes to providing a user with a good feeling of responsiveness from >> an application (and if it allows the application to more effectively >> pipeline something, there may be an actual genuine improvement in >> responsiveness, rather than just the appearance of one). > > This sounds like optimizing for a super-rare case. And please do tell me > if you've timed this.
I do, it's easy. I have several Maildir directories with tens thousands of messages who take 10-15 seconds to be listed through NFS (starting from a ext3 file system). On the contrary, commands like "grep -r "whatever" ." start displaying output immediately. Without something like opendir(), it's basically making impossible to achieve this in Python. -- Giovanni Bajo Develer S.r.l. http://www.develer.com _______________________________________________ Python-3000 mailing list Python-3000@python.org http://mail.python.org/mailman/listinfo/python-3000 Unsubscribe: http://mail.python.org/mailman/options/python-3000/archive%40mail-archive.com
