Re: Could frozendict or frozenmap be of some use for PEP 683 (Immortal objects)?
On Wed, 9 Mar 2022 at 23:28, Martin Di Paola wrote: > Think in the immutable strings (str). What would happen with a program > that does heavy parsing? I imagine that it will generate thousands of > little strings. If those are immortal, the program will fill its memory > very quickly as the GC will not reclaim their memory. Well, as far as I know immortality was also suggested for interned strings. If I understood well, the problem with "normal" strings is that they are not really immutable in CPython. They have cache etc. Also frozendict caches hash, but that cache can be easily removed. -- https://mail.python.org/mailman/listinfo/python-list
Re: Could frozendict or frozenmap be of some use for PEP 683 (Immortal objects)?
I perhaps didn't understand the PEP completely but I think that the goal of marking some objects as immortal is to remove the refcount from they. For immutable objects that would make them truly immutable. However I don't think that the immortality could be applied to any immutable object by default. Think in the immutable strings (str). What would happen with a program that does heavy parsing? I imagine that it will generate thousands of little strings. If those are immortal, the program will fill its memory very quickly as the GC will not reclaim their memory. The same could happen with any frozenfoo object. Leaving immortality to only a few objects, like True and None makes more sense as they are few (bound if you want). On Wed, Mar 09, 2022 at 09:16:00PM +0100, Marco Sulla wrote: As title. dict can't be an immortal object, but hashable frozendict and frozenmap can. I think this can increase their usefulness. Another advantage: frozen dataclass will be really immutable if they could use a frozen(dict|map) instead of a dict as __dict__ -- https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
Could frozendict or frozenmap be of some use for PEP 683 (Immortal objects)?
As title. dict can't be an immortal object, but hashable frozendict and frozenmap can. I think this can increase their usefulness. Another advantage: frozen dataclass will be really immutable if they could use a frozen(dict|map) instead of a dict as __dict__ -- https://mail.python.org/mailman/listinfo/python-list
