JH wrote: > Hi > > I found that a type/class are both a subclass and a instance of base > type "object". > > It conflicts to my understanding that: > > 1.) a type/class object is created from class statement > 2.) a instance is created by "calling" a class object. > > A object should not be both a class and an instance at the same time. > > Further I found out there is a special type call "type" that is a > subclass of base type "object". All other types are instances of this > type. Even base type "object" is an instance of this special type. > > What is role of this type "type" in object creation? Could someone > there straighten this concept a little? > > For example (Python2.5): > > >>>>issubclass(int, object) > > True > >>>>isinstance(int, object) > > True > >>>>print type(int) > > <type 'type'> > >>>>isinstance(int, type) > > True > >>>>issubclass(int, type) > > False > >>>>issubclass(type, object) > > True > >>>>isinstance(type, object) > > True > >>>>isinstance(object, type) > > True > >
Here is a primer on the topic: http://www.python.org/download/releases/2.2/descrintro/ James -- http://mail.python.org/mailman/listinfo/python-list
