How to use the jinja.nodes.Node function in Jinja

def __init__(self, environment, source):
        if isinstance(source, basestring):
            self.source = parse_and_translate(environment, source)
        elif isinstance(source, Node):
            self.source = translate(environment, source)
        else:
            raise TypeError('unsupported source type %r' %
                            source.__class__.__name__)
        self.environment = environment
        self.generate_func = None

def __init__(self, extends, body, lineno=None, filename=None):
        Node.__init__(self, lineno, filename)
        self.extends = extends
        self.body = body

    def get_items(self):
        return [self.extends, self.body]

    def __repr__(self):
        return 'Template(%r, %r)' % (
            self.extends,
            self.body
        )


class ForLoop(Node):
    """
    A node that represents a for loop
    """

    def __init__(self, item, seq, body, else_, recursive, lineno=None,
                 filename=None):
        Node.__init__(self, lineno, filename)
        self.item = item
        self.seq = seq
        self.body = body
        self.else_ = else_
        self.recursive = recursive

    def get_items(self):
        return [self.item, self.seq, self.body, self.else_, self.recursive]

"""
    A node that stores multiple childnodes.
    """

    def __init__(self, data, lineno=None, filename=None):
        Node.__init__(self, lineno, filename)
        list.__init__(self, data)

    def get_items(self):
        return list(self)

    def __repr__(self):
        return 'NodeList(%s)' % list.__repr__(self)


class Template(Node):
    """
    Node that represents a template.
    """

    def __init__(self, extends, body, lineno=None, filename=None):
        Node.__init__(self, lineno, filename)
        self.extends = extends
        self.body = body

    def get_items(self):
        return [self.extends, self.body]

    def __repr__(self):
        return 'Template(%r, %r)' % (
            self.extends,
            self.body

def get_child_nodes(self):
        return [x for x in self.get_items() if isinstance(x, Node)]

def __init__(self, body, filters, lineno=None, filename=None):
        Node.__init__(self, lineno, filename)
        self.body = body
        self.filters = filters

    def get_items(self):
        return [self.body] + list(self.filters)

    def __repr__(self):
        return 'Filter(%r, %r)' % (
            self.body,
            self.filters
        )


class Block(Node):
    """
    A node that represents a block.
    """

    def __init__(self, name, body, lineno=None, filename=None):
        Node.__init__(self, lineno, filename)
        self.name = name
        self.body = body

    def replace(self, node):
        """
        Replace the current data with the copied data of another block
        node.
        """
        assert node.__class__ is Block
        self.lineno = node.lineno

def __init__(self, expr, body, lineno=None, filename=None):
        Node.__init__(self, lineno, filename)
        self.expr = expr
        self.body = body

    def get_items(self):
        return [self.expr, self.body]

    def __repr__(self):
        return 'Call(%r, %r)' % (
            self.expr,
            self.body
        )


class Set(Node):
    """
    Allows defining own variables.
    """

    def __init__(self, name, expr, scope_local, lineno=None, filename=None):
        Node.__init__(self, lineno, filename)
        self.name = name
        self.expr = expr
        self.scope_local = scope_local

    def get_items(self):
        return [self.name, self.expr, self.scope_local]

    def __repr__(self):
        return 'Set(%r, %r, %r)' % (
            self.name,

def __init__(self, text, variables, lineno=None, filename=None):
        Node.__init__(self, lineno, filename)
        self.text = text
        self.variables = variables

    def get_items(self):
        return [self.text] + list(self.variables)

    def __repr__(self):
        return 'Text(%r, %r)' % (
            self.text,
            self.variables
        )


class NodeList(list, Node):
    """
    A node that stores multiple childnodes.
    """

    def __init__(self, data, lineno=None, filename=None):
        Node.__init__(self, lineno, filename)
        list.__init__(self, data)

    def get_items(self):
        return list(self)

    def __repr__(self):
        return 'NodeList(%s)' % list.__repr__(self)


class Template(Node):

"""
        Create an independent clone of this node.
        """
        return copy(self)

    def get_items(self):
        return [self.name, self.body]

    def __repr__(self):
        return 'Block(%r, %r)' % (
            self.name,
            self.body
        )


class Include(Node):
    """
    A node that represents the include tag.
    """

    def __init__(self, template, lineno=None, filename=None):
        Node.__init__(self, lineno, filename)
        self.template = template

    def get_items(self):
        return [self.template]

    def __repr__(self):
        return 'Include(%r)' % (
            self.template
        )

"""
    A node that represents the cycle statement.
    """

    def __init__(self, seq, lineno=None, filename=None):
        Node.__init__(self, lineno, filename)
        self.seq = seq

    def get_items(self):
        return [self.seq]

    def __repr__(self):
        return 'Cycle(%r)' % (self.seq,)


class Print(Node):
    """
    A node that represents variable tags and print calls.
    """

    def __init__(self, expr, lineno=None, filename=None):
        Node.__init__(self, lineno, filename)
        self.expr = expr

    def get_items(self):
        return [self.expr]

    def __repr__(self):
        return 'Print(%r)' % (self.expr,)


class Macro(Node):

"""
    A node that represents variable tags and print calls.
    """

    def __init__(self, expr, lineno=None, filename=None):
        Node.__init__(self, lineno, filename)
        self.expr = expr

    def get_items(self):
        return [self.expr]

    def __repr__(self):
        return 'Print(%r)' % (self.expr,)


class Macro(Node):
    """
    A node that represents a macro.
    """

    def __init__(self, name, arguments, body, lineno=None, filename=None):
        Node.__init__(self, lineno, filename)
        self.name = name
        self.arguments = arguments
        self.body = body

    def get_items(self):
        return [self.name] + list(chain(*self.arguments)) + [self.body]

    def __repr__(self):
        return 'Macro(%r, %r, %r)' % (
            self.name,