class Foo(object):

    def __init__(self):
        self.counter = 0

    def __get__(self, x, type_of_x):
        def getter(attr):
            self.counter += 1
            return self.counter
        return getter


foo = Foo()


class X(object):
    __add__ = foo

class Y(object):
    __getattribute__ = foo

class Z(object):
    __getattr__ = foo

print X() + 5
print X() + 7

print Y().spam
print Y().bar

print Z().bar
print Z().baz