How to use the html5lib.treebuilders._base.Node function in html5lib

def __init__(self, element, soup, namespace):
        html5lib.treebuilders._base.Node.__init__(self, element.name)
        self.element = element
        self.soup = soup
        self.namespace = namespace

def __init__(self, element, soup, namespace):
        treebuilder_base.Node.__init__(self, element.name)
        self.element = element
        self.soup = soup
        self.namespace = namespace

def __setitem__(self, name, value):
        "set attr", name, value
        self.element[name] = value
    def items(self):
        return list(self.attrs.items())
    def keys(self):
        return list(self.attrs.keys())
    def __len__(self):
        return len(self.attrs)
    def __getitem__(self, name):
        return self.attrs[name]
    def __contains__(self, name):
        return name in list(self.attrs.keys())


class Element(html5lib.treebuilders._base.Node):
    def __init__(self, element, soup, namespace):
        html5lib.treebuilders._base.Node.__init__(self, element.name)
        self.element = element
        self.soup = soup
        self.namespace = namespace

    def appendChild(self, node):
        if (node.element.__class__ == NavigableString and self.element.contents
            and self.element.contents[-1].__class__ == NavigableString):
            # Concatenate new text onto old text node
            # XXX This has O(n^2) performance, for input like
            # "aaa..."
            old_element = self.element.contents[-1]
            new_element = self.soup.new_string(old_element + node.element)
            old_element.replace_with(new_element)
        else:

def __init__(self, element, soup, namespace):
        treebuilder_base.Node.__init__(self, element.name)
        self.element = element
        self.soup = soup
        self.namespace = namespace

def __init__(self, element, soup):
        treebuilder_base.Node.__init__(self, None)
        self.element = element
        self.soup = soup

def __setitem__(self, name, value):
        "set attr", name, value
        self.element[name] = value
    def items(self):
        return list(self.attrs.items())
    def keys(self):
        return list(self.attrs.keys())
    def __len__(self):
        return len(self.attrs)
    def __getitem__(self, name):
        return self.attrs[name]
    def __contains__(self, name):
        return name in list(self.attrs.keys())


class Element(html5lib.treebuilders._base.Node):
    def __init__(self, element, soup, namespace):
        html5lib.treebuilders._base.Node.__init__(self, element.name)
        self.element = element
        self.soup = soup
        self.namespace = namespace

    def appendChild(self, node):
        if (node.element.__class__ == NavigableString and self.element.contents
            and self.element.contents[-1].__class__ == NavigableString):
            # Concatenate new text onto old text node
            # XXX This has O(n^2) performance, for input like
            # "aaa..."
            old_element = self.element.contents[-1]
            new_element = self.soup.new_string(old_element + node.element)
            old_element.replace_with(new_element)
            self.soup._most_recent_element = new_element

def __init__(self, element, soup, namespace):
        treebuilder_base.Node.__init__(self, element.name)
        self.element = element
        self.soup = soup
        self.namespace = namespace

def __init__(self, element, soup, namespace):
        html5lib.treebuilders._base.Node.__init__(self, element.name)
        self.element = element
        self.soup = soup
        self.namespace = namespace