How to use the lesscpy.plib.variable.Variable function in lesscpy

def _parse_arg(self, var, arg, scope):
        """ Parse a single argument to mixin.
        args:
            var (Variable object): variable
            arg (mixed): argument
            scope (Scope object): current scope
        returns:
            Variable object or None
        """
        if isinstance(var, Variable):
            # kwarg
            if arg:
                if utility.is_variable(arg[0]):
                    tmp = scope.variables(arg[0])
                    if not tmp:
                        return None
                    val = tmp.value
                else:
                    val = arg
                var = Variable(var.tokens[:-1] + [val])
        else:
            # arg
            if utility.is_variable(var):
                if arg is None:
                    raise SyntaxError('Missing argument to mixin')
                elif utility.is_variable(arg[0]):

arg (mixed): argument
            scope (Scope object): current scope
        returns:
            Variable object or None
        """
        if isinstance(var, Variable):
            # kwarg
            if arg:
                if utility.is_variable(arg[0]):
                    tmp = scope.variables(arg[0])
                    if not tmp:
                        return None
                    val = tmp.value
                else:
                    val = arg
                var = Variable(var.tokens[:-1] + [val])
        else:
            # arg
            if utility.is_variable(var):
                if arg is None:
                    raise SyntaxError('Missing argument to mixin')
                elif utility.is_variable(arg[0]):
                    tmp = scope.variables(arg[0])
                    if not tmp:
                        return None
                    val = tmp.value
                else:
                    val = arg
                var = Variable([var, None, val])
            else:
                return None
        return var

parsed = [
                v if hasattr(v, 'parse') else v for v in copy.copy(self.args)
            ]
            args = args if isinstance(args, list) else [args]
            vars = [
                self._parse_arg(var, arg, scope)
                for arg, var in zl([a for a in args], parsed)
            ]
            for var in vars:
                if var:
                    var.parse(scope)
            if not arguments:
                arguments = [v.value for v in vars if v]
        if not arguments:
            arguments = ''
        Variable(['@arguments', None, arguments]).parse(scope)

def copy(self):
        """ Return a copy of self
        Returns:
            Variable object
        """
        return Variable([t for t in self.tokens])

else:
                    val = arg
                var = Variable(var.tokens[:-1] + [val])
        else:
            # arg
            if utility.is_variable(var):
                if arg is None:
                    raise SyntaxError('Missing argument to mixin')
                elif utility.is_variable(arg[0]):
                    tmp = scope.variables(arg[0])
                    if not tmp:
                        return None
                    val = tmp.value
                else:
                    val = arg
                var = Variable([var, None, val])
            else:
                return None
        return var