How to use the uritemplate.orderedset.OrderedSet function in uritemplate

"""Parse the variables of the template.

    This returns all of the variable names in the URI Template.

    :returns: Set of variable names
    :rtype: set

    Example::

        variables('https://api.github.com{/end})
        # => {'end'}
        variables('https://api.github.com/repos{/username}{/repository}')
        # => {'username', 'repository'}

    """
    return OrderedSet(URITemplate(uri).variable_names)

def __eq__(self, other):
        if isinstance(other, OrderedSet):
            return len(self) == len(other) and list(self) == list(other)
        return not self.isdisjoint(other)

def __init__(self, uri):
        #: The original URI to be parsed.
        self.uri = uri
        #: A list of the variables in the URI. They are stored as
        #: :class:`URIVariable`\ s
        self.variables = [
            URIVariable(m.groups()[0]) for m in template_re.finditer(self.uri)
        ]
        #: A set of variable names in the URI.
        self.variable_names = OrderedSet()
        for variable in self.variables:
            for name in variable.variable_names:
                self.variable_names.add(name)