[Python-3000] sets in P3K? (original) (raw)

Brian Harring ferringb at gmail.com
Fri Apr 28 23:32:07 CEST 2006

On Fri, Apr 28, 2006 at 08:09:24AM -0400, Greg Wilson wrote:

OK, OK, just so I can get it off my chest:

- introduce '@' as a prefix operator meaning 'freeze'. - [1, 2, 3] is a mutable sequence (our old friend the list) - {1, 2, 3} is a mutable set - @{1, 2, 3} is an immutable set (i.e., a frozen set --- frozen at creation, so all current optimizations possible) - @[1, 2, 3] is an immutable sequence (i.e., a tuple) Now, if only I can figure out whether "@x" means "bind the name x permanently to its current value to create a symbolic constant" or "freeze the object to which x currently refers"... ;-)

Potentially a stupid question, but I've been following this thread for a while and I'm still not seeing the real gain of extending the syntax for frozen markers/set literals.

Someone care to recap what actually is gained from having a set literal? ~harring -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 189 bytes Desc: not available Url : http://mail.python.org/pipermail/python-3000/attachments/20060428/a94bf0b4/attachment.pgp

More information about the Python-3000 mailing list