Setting an attribute without calling __setattr__()
John Machin
sjmachin at lexicon.net
Fri Apr 25 17:22:21 EDT 2008
On Apr 26, 7:01 am, Joshua Kugler <jkug... at bigfoot.com> wrote:
> OK, I'm sure the answer is staring me right in the face--whether that answer
> be "you can't do that" or "here's the really easy way--but I am stuck. I'm
> writing an object to proxy both lists (subscriptable iterables, really) and
> dicts.
>
> My init lookslike this:
>
> def __init__(self, obj=None):
> if type(obj).__name__ in 'list|tuple|set|frozenset':
> self.me = []
> for v in obj:
> self.me.append(ObjectProxy(v))
> elif type(obj) == dict:
> self.me = {}
> for k,v in obj.items():
> self.me[k] = ObjectProxy(v)
>
> and I have a __setattr__ defined like so:
>
> def __setattr__(self, name, value):
> self.me[name] = ObjectProxy(value)
>
> You can probably see the problem.
>
> While doing an init, self.me = {} or self.me = [] calls __setattr__, which
> then ends up in an infinite loop, and even it it succeeded
>
> self.me['me'] = {}
>
> is not what I wanted in the first place.
>
> Is there a way to define self.me without it firing __setattr__?
>
Consider reading the *second* paragraph about __setattr__ in section
3.4.2 of the Python Reference Manual.
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