On Feb 13, 2008 1:42 PM, Eric Smith <[EMAIL PROTECTED]> wrote: > Guido van Rossum wrote: > >> Much to my surprise, this already works: > >> > >> >>> format(oldstyle(), '+^50s') > >> '+++++<__main__.oldstyle instance at 0x3d91f8>+++++' > >> >>> > >> > >> So I guess it's a moot point. I'm using the same code as I use in 3.0, > >> where I call: > >> meth = _PyType_Lookup(Py_TYPE(value), format_str); > >> where format_str is "__format__" interned. And I'm getting a value back > >> for old style classes. > >> > >> Eric. > > > > But now try overriding __format__(). The 3.0 code uses > > _PyType_Lookup() which is not traversing the class dicts for classic > > classes, so it won't find __format__ overrides. > > > > Okay, I see and understand that issue. But looking at len or getattr, I > don't see how to generalize it to __format__. __len__ and __getattr__ > have special support in the classes, with cl_getattr, tp_getattr, etc. > > I hate to be dense, but could you point me to some code that does > something similar but looks up the method by name?
I'm not sure if it'll be exactly analogous, but you might look at __trunc__ and math.trunc for inspiration. -- Namasté, Jeffrey Yasskin http://jeffrey.yasskin.info/ _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
