django urlencode

try:
        project_list_page = paginator.page(page)
    except (EmptyPage, InvalidPage):
        project_list_page = paginator.page(paginator.num_pages)

    if project_list_page.has_previous:
        get_query_dict.__setitem__('page',str(project_list_page.next_page_number()))
        urlquerystring_next_page = get_query_dict.urlencode()
    if project_list_page.has_next:
        get_query_dict.__setitem__('page',str(project_list_page.previous_page_number()))
        urlquerystring_previous_page = get_query_dict.urlencode()