How to use the param.parameterized.bothmethod function in param

    @bothmethod
    def instance(self_or_cls,**params):
        """
        Return an instance of this class, copying parameters from any
        existing instance provided.
        """

        if isinstance (self_or_cls,ParameterizedMetaclass):
            cls = self_or_cls
        else:
            p = params
            params = dict(self_or_cls.get_param_values())
            params.update(p)
            params.pop('name')
            cls = self_or_cls.__class__

        inst=Parameterized.__new__(cls)

    @bothmethod
    def get_plot(self_or_cls, obj, renderer=None):
        """
        Given a HoloViews Viewable return a corresponding plot instance.
        """
        # Initialize DynamicMaps with first data item
        initialize_dynamic(obj)

        if not isinstance(obj, Plot):
            if not displayable(obj):
                obj = collate(obj)
                initialize_dynamic(obj)
            obj = Compositor.map(obj, mode='data', backend=self_or_cls.backend)

        if not renderer:
            renderer = self_or_cls
            if not isinstance(self_or_cls, Renderer):

    @bothmethod
    def entries(self_or_cls, filename):
        with zipfile.ZipFile(filename, 'r') as f:
            return [el for el in f.namelist() if el != 'metadata']

    @bothmethod
    def _save_prefix(self_or_cls, ext):
        "Hook to prefix content for instance JS when saving HTML"
        return

    @bothmethod
    def pprint(cls_or_slf, node):
        reprval = cls_or_slf.serialize(cls_or_slf.recurse(node))
        if sys.version_info.major == 2:
            return str(reprval.encode("utf8"))
        else:
            return str(reprval)

    @bothmethod
    def shift(cls_or_slf, lines, shift=0):
        return [(lvl+shift, line) for (lvl, line) in lines]

    @bothmethod
    def save(self_or_cls, obj, filename, key={}, info={}, **kwargs):
        base_info = {'file-ext': 'hvz', 'mime_type':self_or_cls.mime_type}
        key = self_or_cls._merge_metadata(obj, self_or_cls.key_fn, key)
        info = self_or_cls._merge_metadata(obj, self_or_cls.info_fn, info, base_info)
        compression = zipfile.ZIP_STORED if self_or_cls.compress else zipfile.ZIP_DEFLATED

        filename = self_or_cls._filename(filename) if isinstance(filename, str) else filename
        with zipfile.ZipFile(filename, 'w', compression=compression) as f:

            if isinstance(obj, Layout) and not isinstance(obj, Overlay):
                entries = ['.'.join(k) for k in obj.data.keys()]
                components = list(obj.data.values())
                entries = entries if len(entries) > 1 else [entries[0]+'(L)']
            else:
                entries = ['%s.%s' % (group_sanitizer(obj.group, False),
                                      label_sanitizer(obj.label, False))]

    @bothmethod
    def _save_prefix(self_or_cls, ext):
        "Hook to prefix content for instance JS when saving HTML"
        if ext == 'html':
            return '\n'.join(self_or_cls.html_assets()).encode('utf8')
        return

    @bothmethod
    def recurse(cls_or_slf, node, attrpath=None, attrpaths=[], siblings=[], level=0, value_dims=True):
        """
        Recursive function that builds up an ASCII tree given an
        AttrTree node.
        """
        level, lines = cls_or_slf.node_info(node, attrpath, attrpaths, siblings, level, value_dims)
        attrpaths = ['.'.join(k) for k in node.keys()] if  hasattr(node, 'children') else []
        siblings = [node.get(child) for child in attrpaths]
        for attrpath in attrpaths:
            lines += cls_or_slf.recurse(node.get(attrpath), attrpath, attrpaths=attrpaths,
                                 siblings=siblings, level=level+1, value_dims=value_dims)
        return lines

    @param.parameterized.bothmethod
    def add_aliases(self_or_cls, **kwargs):
        """
        Conveniently add new aliases as keyword arguments. For instance
        you can add a new alias with add_aliases(short='Longer string')
        """
        self_or_cls.aliases.update({v:k for k,v in kwargs.items()})