hasattr + __getattr__: I think this is Python bug

[Bruno Desthuilliers]

Duncan Booth a écrit :
> Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid> wrote:
> 
>> If you don't want to create as many Whatever instances as MyClass 
>> instances, you can create a single Whatever instance before defining 
>> your class:
>>
>> DEFAULT_WHATEVER = Whathever()
>>
>> class MyClass(object):
>>      def __init__(self, x, y):
>>          self.x = x
>>          self.y = y
>>          self.size = DEFAULT_WHATEVER
>>
>>
> 
> Or you could create the default as a class attribute 

from the OP:
"""
I have a class (FuncDesigner oofun) that has no attribute "size", but
it is overloaded in __getattr__, so if someone invokes
"myObject.size", it is generated (as another oofun) and connected to
myObject as attribute.
"""

so this solution won't obviously work in this case !-)

Also and FWIW, I wouldn't advocate this solution if the "default" class 
attribute is of a mutable type.