Hi,
I have a container class A and I want to add functionality to it by
using a decorator class B, as follows:
class A(object):
def __len__(self):
return 5
class B(object):
def __init__(self, a):
self._a = a
def __getattr__(self, attr):
return getattr(self._a, attr)
def other_methods(self):
blah blah blah
I was expecting len(B) to return 5 but I get
AttributeError: type object 'B' has no attribute '__len__'
instead.
I was expecting len() to call B.__len__() which would invoke
B.__getattr__ to call A.__len__ but __getattr__ is not being called.
I can work around this, but I am curious if anyone knows _why_
__getattr__ is not being called in this situation.
Thanks
Tim
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