[Tutor] Class Attribute "Overloading?"

Kent Johnson kent37 at tds.net
Thu Aug 16 03:51:31 CEST 2007

Alan Gauld wrote:
> "Vincent Gulinao" <vincent.gulinao at gmail.com> wrote in message 
> news:fcc3e6170708151159lf302c3er636eabb627606f23 at mail.gmail.com...
>> Sorry about that. I want something like:
>> class foo:
>>    def __init__(self):
>>         self.attr1 = None
>>    def get_attr1(self):
>>         if not self.attr1:
>>             attr1 = <get value from DB, very expensive query>
>>             self.attr1 = attr1
>>         return self.attr1
>> such that:
>> foo_instance = foo()
>> foo_instance.get_attr1()
>> foo_instance.attr1
>> gets the same value.
> That looks like an ideal candidate for a "property".

I guess the requirements are still not clear. If there is just one 
attribute to be read from the database, a property will work well. If 
the OP wants to delegate many attributes, the __getattr__ approach might 
be simpler.


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