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Mixing in new-style classes in Zope 2.7Related by category
Python new-style classes and the super() function
python classes, new style, new-style, classes, super
12th of July 2008
I've never really understood the impact of new-style Python classes and what it means to your syntax until now. With new-style classes you can use the super() builtin, otherwise you can't. This works for new-style classes:
class Farm(object):
def __init__(self): pass
class Barn(Farm):
def __init__(self):
super(Barn, self).__init__()
def __init__(self): pass
class Barn(Farm):
def __init__(self):
super(Barn, self).__init__()
If you want to do the same for old-style classes you simply can't use super() so you'll have to do this:
class Farm:
def __init__(self): pass
class Barn(Farm):
def __init__(self):
Farm.__init__(self)
def __init__(self): pass
class Barn(Farm):
def __init__(self):
Farm.__init__(self)
Strange that I've never realised this before. The reason I did now was that I had to back-port some code into Zope 2.7 which doesn't support setting security on new-style classes.
Now I need to do some reading on new-style classes because clearly I haven't understood it all.
Comment
Paul Hildebrandt -
12th July 2008
[«« Reply to this]
Property is one of my favorite things about new style classes. They can make something akward seem more pythonic.
Property is one of my favorite things about new style classes. They can make something akward seem more pythonic.
Peter Bengtsson -
13th July 2008
[«« Reply to this]
I like the syntax and the look of them but rarely use it. I find it a little bit a solution to a problem that isn't really a problem. In the real world you either just leave the attributes as they are and/or you write full-blown attribute getters/setters that mix in business logic or other legacy fixing logic.
I like the syntax and the look of them but rarely use it. I find it a little bit a solution to a problem that isn't really a problem. In the real world you either just leave the attributes as they are and/or you write full-blown attribute getters/setters that mix in business logic or other legacy fixing logic.
fdfdgdfg -
13th July 2008
[«« Reply to this]
You *can* use super, but you shouldn't.
http://fuhm.net/super-harmful/
You *can* use super, but you shouldn't.
http://fuhm.net/super-harmful/
Super is not a function, it's a type (surprise)