Section 2.3 of the Python 2.5. tutorial "The following sections describe the standard types that are built into the interpreter. Historically, Python's built-in types have differed from user-defined types because it was not possible to use the built-in types as the basis for object-oriented inheritance. With the 2.2 release this situation has started to change, although the intended unification of user-defined and built-in types is as yet far from complete. "
"Far from complete"? Have I missed something? -- http://mail.python.org/mailman/listinfo/python-list