I'm trying to create a proxy (wrapper) object so I can modify behaviour of an already instantiated object. Attributes of a wrapper class are set to a newly generated class (using type) along with attributes of an underlying object, it's done this way because Python __magic __ methods work correctly only if they are members of a class. So cls is a wrapper class, client is the underlying object:
def __new__(cls, client, *args, **kwargs):
ns = {}
for i, attr in inspect.getmembers(client):
if i in ('__init__', '__new__', '__getattribute__', '__dict__'):
continue
ns[i] = attr
for i in cls.__dict__:
if i in ('__new__',):
continue
elif i == '__init__':
ns['_init_'] = getattr(cls, i)
continue
attr = getattr(cls, i)
ns[i] = attr
P = type(cls.__name__ + "." + client.__class__.__name__,
(Proxy2.BaseProxy,), ns)
P._client_ = client
return P(*args, **kwargs)
The problem comes from @staticmethod/@classmethod in the wrapper class. I cannot call static method from an instance because self is being passed to it. I've tried to use __get__ but without success. Here's a minimal example which fails:
class SuperA:
@staticmethod
def static():
return 'static?'
class A:
def __getattribute__(self, attr):
v = object.__getattribute__(self, attr)
if hasattr(v, '__get__'):
v2 = v.__get__(None, self)
return v2
return v
A.static = getattr(SuperA, "static")
print(A.static()) # success
print(A().static()) # fail
