Antoon Pardon wrote: > Op 2005-12-14, Christopher Subich schreef > > Doesn't work; duck typing is emphatically not subclass-typing. > > I don't see how that is relevant. > > > For this > > system to still work and be as general as Python is now (without having > > to make all variables 'object's), > > But the way Guido wants python to evolve would make all variables > objects. This is what PEP 3000 states. > > Support only new-style classes; classic classes will be gone. > > As far as I understand this would imply that all classes are subclasses > of object and thus that isinstance(var, object) would be true for all > variables.
But that's still useless for your purposes. Everything will be derived from object but it doesn't mean everything file-like will be derived from file or everything dictionary-like will be derived from dictionary. Duck-typing means that code told to 'expect' certain types will break unnecessarily when a different-yet-equivalent type is later passed to it. -- Ben Sizer -- http://mail.python.org/mailman/listinfo/python-list
