substitution of a method by a callable object

[netimen]

Can I substitute a method of a class by a callable object (not a
function)? I can very easy insert my function in a class as a method,
but an object - can't.

I have the following:

class Foo(object):
    pass

class Obj(object):
    def __call__(self, obj_self):
        print 'Obj'

def func(self):
    print 'func'

f = Foo()
Foo.meth = func
f.meth() # all goes OK
Foo.meth = Obj()
f.meth() # I get TypeError: __call__() takes exactly 2 arguments (1
given)
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