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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 create_DOM_node_from_dict(d, name, parent_node):
 """ Dumps dict data to an ``xml.etree.ElementTree.SubElement`` DOM subtree object and attaches it to the specified DOM parent node. The created subtree object is named after the specified name. If the supplied dict is ``None`` no DOM node is created for it as well as no DOM subnodes are generated for eventual ``None`` values found inside the dict :param d: the input dictionary :type d: dict :param name: the name for the DOM subtree to be created :type name: str :param parent_node: the parent DOM node the newly created subtree must be attached to :type parent_node: ``xml.etree.ElementTree.Element`` or derivative objects :returns: ``xml.etree.ElementTree.SubElementTree`` object """

    if d is not None:
        root_dict_node = ET.SubElement(parent_node, name)
        for key, value in d.items():
            if value is not None:
                node = ET.SubElement(root_dict_node, key)
                node.text = str(value)
        return root_dict_node