def implicit_int(cls):
    def wrapper(self, item):
        if hasattr(object, item):
            return object.__getattr__(self, attr)
        else:
            return 0
    cls.__getattr__ = wrapper
    return cls

'''Тесты'''

@implicit_int
class A:
    x = -1

a = A()
print(a)
print(a.x)
print(a.e)
print(a.e + 589)  # Вывод: 589