taining
        lists of package objects.  The contents of the lists are
        specified in various ways by the arguments.

        :param pkgnarrow: a string specifying which types of packages
           lists to produces, such as updates, installed, available,
           etc.
        :param patterns: a list of names or wildcards specifying
           packages to list
        :param showdups: whether to include duplicate packages in the
           lists
        :param ignore_case: whether to ignore case when searching by
           package names
        :param reponame: limit packages list to the given repository
        :return: a :class:`misc.GenericHolder` instance with the
           following lists defined::

             available = list of packageObjects
             installed = list of packageObjects
             upgrades = tuples of packageObjects (updating, installed)
             extras = list of packageObjects
             obsoletes = tuples of packageObjects (obsoleting, installed)
             recent = list of packageObjects
        N)