Andrea Crotti wrote:
> I wanted to add a couple of parameters to a class from a given library
> (paste-script), but without changing the original code.
> So I thought, I create a wrapper class which adds what I need, and then
> dispatch all the calls to the super class.
>
> My following attempt gives, however, a recursion error, but why?
Inside __getattribute__() you ask for self.first_var which triggers another
__getattribute__() call that once again trys to determine the first_var
attribute before it returns...
Try using __getattr__() instead which is only triggered for non-existent
attributes
def __getattr__(self, name):
return getattr(self.first_var, name)
or check for the attributes you don't want to delegate explicitly:
def __getattribute__(self, name):
if name == "first_var":
return super(PSIVar, self).__getattribute__(name)
return getattr(self.first_var, name)
> class PSIVar(object):
> """Extend var implementation from the paste-script, to add the
> ability of correlating variables
> >>> v = var("name", "desc")
> >>> v.name == 'name'
> True
> >>> v1 = PSIVar(v)
> >>> v1.name == 'name'
> True
> """
> def __init__(self, first_var, other=None, fun=None):
> # this is of type defined there
> self.first_var = first_var
> if other is not None:
> self.other = other
> self.fun = fun
> assert callable(self.fun)
>
> # now try to dispatch every method call to the other class
> # must probably call the super class
> def __getattribute__(self, attr):
> return self.first_var.__getattribute__(attr)
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