Can someone write a simple example of python old style class and new style class?

Question

While there are several articles written about new classes versus old classed I wasn't able to see a basic example with old/new style.

Note that old-style classes are gone in Python 3, so you shouldn't care too much. See also here: stackoverflow.com/questions/4015417/… and here: stackoverflow.com/questions/54867/… — Cito
– Cito, Commented Nov 3, 2011 at 11:51

jro · Accepted Answer · 2011-11-03 11:42:04Z

2

The only syntactic difference is that new style classes inherit from object:

class Old:
    ...

class New(object):
    ....

answered Nov 3, 2011 at 11:42

jro

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AlG · Accepted Answer · 2011-11-03 11:56:53Z

0

I believe this wiki post is what you are looking for:

 <snip> 
 The minor syntactic difference is that New Style Classes happen
 to inherit from object.

 class Old1:
     ...

 class Old2(Old1, UserDict): # Assuming UserDict is still old-style
     ...

 vs

 class New1(object):
     ... class New2(New1):
     ... class New3(Old1, New2):
     ... class New4(dict, Old1):  # dict is a newstyle class
 <snip>

edited Nov 3, 2011 at 11:56

answered Nov 3, 2011 at 11:43

AlG

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2 Comments

Duncan Over a year ago

class New4 is particularly nasty in your example: it is a new style class, but instead of having object as the last class in the MRO, the MRO actually goes New4, dict, object, Old1.

AlG Over a year ago

@Duncan I can't take credit for that example. It's directly copied from the linked Wiki page. I'll update my post to be clear.

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