On Tue, Feb 5, 2013 at 4:29 AM, Saul Spatz wrote:
> class Adder(): # python 2.7, classic class
>
> Why does this work for __add__ and not for __getattr__?
Is this a case of "why bother trying to understand it, just use
new-style classes"? They do make more sense in many ways.
ChrisA
Saul Spatz wrote:
> Thanks, Peter. I realize this is getting sort of academic now, as I know
> how to do exactly what I want, but I'm still confused. Is __getattr__ a
> special case then, even for classic classes?
Well, it never occured to me to try a per-instance __getattr__(), but you
are ab
Thanks, Peter. I realize this is getting sort of academic now, as I know how
to do exactly what I want, but I'm still confused. Is __getattr__ a special
case then, even for classic classes?
class Adder(): # python 2.7, classic class
def __init__(self, x):
self.x = x
self.
Peter Otten wrote:
> Saul Spatz wrote:
>
>> Now I have another question. If dunder methods are looked up only in the
>> class, not the instance, why did defining __nonzero__ the way I did work?
>> Shouldn't I have had to define it with a def? Is __nonzero__ a special
>> case?
>
> Unfortunately
Saul Spatz wrote:
> Now I have another question. If dunder methods are looked up only in the
> class, not the instance, why did defining __nonzero__ the way I did work?
> Shouldn't I have had to define it with a def? Is __nonzero__ a special
> case?
Unfortunately the situation is a bit more co
On Sunday, February 3, 2013 10:35:30 PM UTC-6, Steven D'Aprano wrote:
> On Sun, 03 Feb 2013 17:08:47 -0800, Saul Spatz wrote:
>
>
>
> > I don't understand what's going on at all. Can't I dynamically define
>
> > __getattr__? How should I go about it?
>
>
>
> Special "dunder" methods (Dou
On Sun, 03 Feb 2013 17:08:47 -0800, Saul Spatz wrote:
> I don't understand what's going on at all. Can't I dynamically define
> __getattr__? How should I go about it?
Special "dunder" methods (DoubleUNDERscore) are looked up only on the
class, not on instances. That means that if you try to
On 2/3/2013 8:08 PM, Saul Spatz wrote:
To the good people on comp.lang.python:
I have the following Tkinter class (python 2.7.3):
from Tkinter import *
class ScrolledCanvas(Frame): def __init__(self, master, width,
height, bg, cursor): Frame.__init__(self, master) self.__nonzero__ =
lambda: Tr
On Mon, Feb 4, 2013 at 12:08 PM, Saul Spatz wrote:
> class ScrolledCanvas(Frame):
> def __init__(self, master, width, height, bg, cursor):
> canv = self.canvas = Canvas(self, bg=bg, relief=SUNKEN)
>
> def __getattr__(self, name):
> return getattr(self.canvas, name)
Trying to get my he
To the good people on comp.lang.python:
I have the following Tkinter class (python 2.7.3):
from Tkinter import *
class ScrolledCanvas(Frame):
def __init__(self, master, width, height, bg, cursor):
Frame.__init__(self, master)
self.__nonzero__ = lambda: True
canv = self.canvas = Can
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