[EMAIL PROTECTED] wrote:
> On Sep 6, 10:26 am, rh0dium <[EMAIL PROTECTED]> wrote:
>> Hi all,
>>
>> I have the following piece of code and I wanted to set the default
>> attributes based on a dictionary. What I am looking for is a way to
>> take PIPODEFAULTS and assign each one as an attribute for the class
>> pipo. Can someone show me how to do this by iterating over the
>> PIPODEFAULTS and assign them. What I would expect to be able to do is
>> call the class and modify them.
>>
>> example:
>> a = pipo()
>> print a.caseSensitivity
>> "preserve"
>>
>> a.caseSensitivity = "lower"
>> print a.caseSensitivity
>> "lower"
>>
>
>
> I infer from your example that you want
> to set default attributes for *instances of* class pipo
> (not for class pipo itself).
>
> Use setattr:
>
> class pipo(object):
> PIPODEFAULTS = {'caseSensitivity':'preserve',
> 'cellMapTable':'checkPolygon', # etc
> }
> def __init__(self, *args, **kwargs):
> for attr, value in pipo.PIPODEFAULTS.iteritems():
> setattr(self, attr, value)
>
> a = pipo()
> b = pipo()
> print a.caseSensitivity
> a.caseSensitivity = 'lower'
> print a.caseSensitivity
> print b.caseSensitivity
>
> --
> Hope this helps,
> Steven
>
>
This is actually way over-complicated. Remembering that the MRO will
look in the class to resolve the name of an attribute it doesn't find in
the instance you can simply use the class as a repository for the defaults:
>>> class pipo(object):
... caseSensitivity = 'preserve'
... cellMapTable = 'checkPolygon'
... # ...
...
>>> p1 = pipo()
>>> p2 = pipo()
>>> p1.caseSensitivity
'preserve'
>>> p2.caseSensitivity = "lower"
>>> p1.caseSensitivity
'preserve'
>>> p2.caseSensitivity
'lower'
>>>
You could extend the class to allow per-instance defaults to be set in
the __init__() method too (untested):
class pipo(object):
caseSensitivity = "preserve"
cellMapTable = 'checkPolygon'
def __init__(self, ..., **kw):
self.__dict__.update(kw)
p1 = pipo(caseSensitivity='lower')
regards
Steve
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