[Tutor] new book available

[Rodrigues]

> -----Original Message-----
> From: tutor-bounces at python.org [mailto:tutor-bounces at python.org]On
> Behalf Of Alan Gauld
> 
> > author's distinguishing "new" style class definitions
> > from "old" style ones. 
> > 
> > >>>class Test:
> > 
> > >>>class Test (object):
> > 
> > is the newer style. I don't think I've seen this point
> > discussed on PythonTutor or elsewhere. [Have I missed
> > something?]
> 
> Yes, there's been a couple of discussions about new style 
> classes. The fact that they inherit from 'object' (or
> a subclas of object) is indeed the distinguishing feature.
> 
> ie  
> 
> >>> class Number(int):
> 
> is also a new style class because int is a subclass of object...
> 

It's also a new-style class if you set the metaclass, e.g.

>>> class Test:
... 	__metaclass__ = type
... 	
>>> Test.mro()
[<class '__main__.Test'>, <type 'object'>]
>>> 

Best regards,
G. Rodrigues