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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 set(self, obj, value):
 """Set value for obj's attribute. :param obj: Result object or dict to assign the attribute to. :param value: Value to be assigned. """

        assert self.setter is not None, "Setter accessor is not specified."
        if callable(self.setter):
            return self.setter(obj, value)

        assert isinstance(self.setter, string_types), "Accessor must be a function or a dot-separated string."

        def _set(obj, attr, value):
            if isinstance(obj, dict):
                obj[attr] = value
            else:
                setattr(obj, attr, value)
            return value

        path = self.setter.split(".")
        for attr in path[:-1]:
            obj = _set(obj, attr, {})

        _set(obj, path[-1], value)