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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def setup_callables(self):
 """ Setup Callable attributes that belong to this object. """

        defaults = self.get_default_callables()
        for key, value in list(defaults.items()):
            self._postponed_callables.setdefault(key, value)
        for key in self.callables:
            value = self._postponed_callables.pop(key)
            value.setup_callable_system(self.system, init=True)
            setattr(self, key, value)