Arnaud Delobelle <arno...@googlemail.com> writes: > Descriptors to the rescue :) > > def read_body_from(filename): > print "** loading content **" > return "<content of '%s'>" % filename > > # This is a kind of class property > class TemplateFilename(object): > def __get__(self, obj, cls): > return "%s.tmpl" % cls.__name__ > > # And this is a kind of cached class property > class TemplateBody(object): > def __get__(self, obj, cls): > try: > return cls._body > except AttributeError: > cls._body = read_body_from(cls.template_filename) > return cls._body > > class Foo(object): > template_filename = TemplateFilename() > template_body = TemplateBody() > > class FooA(Foo): > pass > > class FooB(Foo): > pass
Very enlightening, thanks! By the way, I completely agree with the other posters in this thread that intricate solutions such as this are likely to be overkill, especially since at this point I have no idea if the inefficiency of reading those templates multiple times would at all matter (frankly, I'd doubt it). But it's certainly been educational to learn about these techniques. One observation: if I implement the descriptor solution as given above, the code works perfectly, but running the code through pychecker now causes an error, because that again causes an attempt to read from the non-existant base class template file "Foo.tmpl"... -- Leo Breebaart <l...@lspace.org> -- http://mail.python.org/mailman/listinfo/python-list
