On Wed, May 7, 2008 at 7:40 PM, Yves Dorfsman <[EMAIL PROTECTED]> wrote: > Does it make a difference if you put subclass object or not ? > > What is the difference between c1 and c2 here: > > class c1: > pass > > class c2(object): > pass
>>> type(c1) <type 'classobj'> >>> type(c1()) <type 'instance'> >>> type(c2) <type 'type'> >>> type(c2()) <class '__main__.c2'> In Python 2.2, classes and types were unified. If a class inherits from object (or any other built-in), it is considered a "new-style" class; otherwise, it is an old-style (or classic) class. There are some differences in their behavior; most notably, descriptors (computer properties) will not work with old-style classes. Old-style classes will go away in Python 3 (I think), and all classes will have object as a base. An introduction to new-style classes: http://www.cafepy.com/article/python_types_and_objects/python_types_and_objects.html A guide to descriptors: http://users.rcn.com/python/download/Descriptor.htm The reference manual on the distinction: http://docs.python.org/ref/node33.html The technical explanation: http://www.python.org/download/releases/2.2.3/descrintro/ -Miles -- http://mail.python.org/mailman/listinfo/python-list
