"Timo Vanwynsberghe" <timo...@gmail.com> wrote
I read that it is advised to subclass object.
Is it really necessary? I mean, everything works, why should I add it to
my
code?
In older versions of Python it made a difference whether you used object
or not. Using object gave you a "new style" class which has several extra
features, without you got an "old style class" without the features.
In Python v3 you only get new style classes and I think you can omit
the object without detriment.
For comparison here are Python v2.5 definitions
class New(object): pass
...
dir(New)
['__class__', '__delattr__', '__dict__', '__doc__', '__getattribute__',
'__hash_
_', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__',
'__repr_
_', '__setattr__', '__str__', '__weakref__']
class Old: pass
...
dir(Old)
['__doc__', '__module__']
As you can see there is quite a lot of extra "stuff" in the New class.
In Python 3:
class New(object): pass
dir(New)
['__class__', '__delattr__', '__dict__', '__doc__', '__eq__',
'__format__', '__ge__', '__getattribute__', '__gt__', '__hash__',
'__init__', '__le__', '__lt__', '__module__', '__ne__', '__new__',
'__reduce__', '__reduce_ex__', '__repr__', '__setattr__',
'__sizeof__', '__str__', '__subclasshook__', '__weakref__']
class Old: pass
dir(Old)
['__class__', '__delattr__', '__dict__', '__doc__', '__eq__',
'__format__', '__ge__', '__getattribute__', '__gt__', '__hash__',
'__init__', '__le__', '__lt__', '__module__', '__ne__', '__new__',
'__reduce__', '__reduce_ex__', '__repr__', '__setattr__',
'__sizeof__', '__str__', '__subclasshook__', '__weakref__']
There is even more "stuff" but it is the same with/without the explicit
'object'.
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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