class static variables and __dict__

Zack goldsz at gmail.com
Sun Feb 17 00:59:27 CET 2008


Zack wrote:
> Diez B. Roggisch wrote:
>> Zack schrieb:
>>> If I have a class static variable it doesn't show up in the __dict__ 
>>> of an instance of that class.
>>>
>>> class C:
>>>    n = 4
>>>
>>> x = C()
>>> print C.__dict__
>>> {'__module__': '__main__', '__doc__': None, 'n': 4}
>>> print x.__dict__
>>> {}
>>>
>>> This behavior makes sense to me as n is not encapsulated in x's 
>>> namespace but what method can you use on x to find all available 
>>> attributes for that class?
>>
>> x.__class__.__dict__
>>
>> Diez
>>
> 
> This would leave out any attributes of base classes. Not that I asked 
> for that functionality in my original post but is there a way to get all 
>  attributes qualified by x. ? I see that I could walk the dict of x, 
> x.__class__ and x.__class__.__bases__ until I exhaust the tree. But is 
> there a built in method for doing this?
> 

I believe this accomplishes what I'm looking for. I'm not positive it is 
correct or if there are cases I've missed. It would be nice if there is 
a simple python builtin for finding the fully qualified dict.

def fullDict(obj):
    '''
    Returns a dict with all attributes qualified by obj.

    obj is an instance of  a class

    '''
    d = obj.__dict__
    # update existing items into new items to preserve inheritance
    tmpD = obj.__class__.__dict__
    tmpD.update(d)
    d = tmpD
    supers = list(obj.__class__.__bases__)
    for c in supers:
       tmpD = c.__dict__
       tmpD.update(d)
       d = tmpD
       supers.extend(c.__bases__)
    return d

-- 
Zack



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