Reinhold Birkenfeld wrote: > Terry Hancock wrote: > >>On Sunday 28 August 2005 04:47 am, Vaibhav wrote: >> >>>I recently heard about 'new-style classes'. I am very sorry if this >>>sounds like a newbie question, but what are they? I checked the Python >>>Manual but did not find anything conclusive. Could someone please >>>enlighten me? Thanks! >> >>"New style" classes are becoming the standard in Python, and must >>always be declared as a subclass of a new style class, including built-in >>classes. > > > [Warning, advanced stuff ahead!] > > That's not entirely true. New-style classes need not be derived from a new- > style class, they need to use the metaclass "type" or a derived. > > So you can also declare a new-style class as > > class new_class: > __metaclass__ = type > > Or, if you want to switch a whole module with many classes to new-style, just > set a > > __metaclass__ = type > > globally. > > > Reinhold What are the pros and cons of the alternate approach?
Colin W. -- http://mail.python.org/mailman/listinfo/python-list
