[Python-Dev] PEP 318 (was re: redefining is)
Raymond Hettinger
python at rcn.com
Thu Mar 25 02:45:08 EST 2004
> > Heh, another use for the class variant of PEP 318. Josiah's code
> > depends on knowing which classes have immutable instances, using a
> > hardcoded set of builtin types. With PEP318, one could do
> >
> > class foo [immutable]:
> > ...
> >
> > with an appropriate definition of immutable that either decorates
the
> > class object or adds to the set of known immutables. Perhaps also
with
> > code to catch and warn against obvious attempts at mutation of
foos...
This PEP is losing its innocence.
Having been repeatedly confronted with FUD arguments in other contexts,
I hate to put on that hat, but I do not think it wise to support too
many varieties of weirdness. Heck, we've already got meta-classes for
that.
> One could even include the disclaimer that any code that modifies an
> instance that is supposed to be immutable, is inherantly broken and is
> not supported
<fud>
I'm sensing an unnamed code smell.
</fud>
Raymond
More information about the Python-Dev
mailing list