Felipe Almeida Lessa schrieb:
> Em Sáb, 2006-03-25 às 21:33 -0800, DrConti escreveu:
> [snip]
> > There was also a suggestion to write a real problem where referencing
> > is really needed.
> > I have one...:
> [snap]
>
> There are loads of discussions about the code you wrote... but... isn't
> bad practice to put the same data in two places? Or am I missing
> something?
>
> Cheers,
>
> --
> Felipe.
Hi Felipe, surely it's bad practice to put the same data in two places.
However I don't want to put the data in the identifier list, but just
the reference to the attributes.
My general problem is to find a way to define subsets of instance
attributes (for example the identifier), so that at later time I can
just iterate over the subset.
In the meantime I found a 90% solution to the problem through lambdas..
See now the code below: maybe you'll understand my point better.
Thanks and Regs,
Davide
class ObjectClass:
""" Test primary Key assignment
"""
def alias(self,key): return lambda: self.__dict__[key]
def __init__(self):
self.Identifier=[]
def getPK(self):
return [ GetPKValue() for GetPKValue in self.Identifier ]
if __name__ == "__main__":
ObjectClassInstantiated=ObjectClass()
ObjectClassInstantiated.AnAttribute='First PK Elem'
ObjectClassInstantiated.AnotherOne='Second PK Elem'
ObjectClassInstantiated.Identifier.append(ObjectClassInstantiated.alias('AnAttribute'))
ObjectClassInstantiated.Identifier.append(ObjectClassInstantiated.alias('AnotherOne'))
print ObjectClassInstantiated.getPK()
ObjectClassInstantiated.AnAttribute='First PK Elem Changed'
print ObjectClassInstantiated.getPK()
>./test.py
['First PK Elem', 'Second PK Elem']
['First PK Elem Changed', 'Second PK Elem']
--> correct now!
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