Django之分页

需要知道：每页多少条数据、一共多少条数据、一共需要多少页、每页从哪开始到哪结束

注意问题：1、用户输入页码为非数字。  2、用户输入页码超出页码范围

 def books(request):
 
     try:            #防止用户直接输入非数字
         page = int(request.GET.get("page"))  #第几页
     except:
         page = 1
 
     total_num = Books.objects.all().count()   #一共多少条数据
     per_page = 10                      #每页多少条数据
     total_page,m = divmod(total_num,per_page)    #一共多少页
     if m:
         total_page+=1
     if page>total_page:
         page = total_page
 
     start_page = (page-1)*10           #每页从那开始
     end_page = page*10                 #每页从哪结束
 
     books = Books.objects.all()[start_page:end_page]
 
     show_pages = 5      #显示多少个页码
     half_show_pages = show_pages//2
     if page < 1+half_show_pages:
         show_start_page = 1
         show_end_page = show_pages
     elif page > total_page-half_show_pages:
         show_start_page = total_page-half_show_pages*2
         show_end_page = total_page
     else:
         show_start_page = page - half_show_pages
         show_end_page = page + half_show_pages
 
     page_list = []
     for i in range(show_start_page,show_end_page+1):
         if i==page:
             temp = '<li class="active"><a href="/books/?page={0}">{0}</a></li>'.format(i)
         else:
             temp = '<li><a href="/books/?page={0}">{0}</a></li>'.format(i)
         page_list.append(temp)
 
     pre_page = page-1
     next_page = page+1
     return render(request,"books.html",locals())

 <div class="box">
     <table class="table">
         <thead>
             <tr>
                 <th>序号</th>
                 <th>书名</th>
             </tr>
         </thead>
         <tbody>
             {% for item in books %}
                 <tr>
                     <td>{{ item.id }}</td>
                     <td>{{ item.name }}</td>
                 </tr>
             {% endfor %}
         </tbody>
     </table>
 
     <nav aria-label="Page navigation">
       <ul class="pagination">
         <li>
             {% if page == 1 %}
               <a href="#" aria-label="Previous">
                 <span aria-hidden="true">&laquo;</span>
               </a>
             {% else %}
                 <a href="?page={{ pre_page }}" aria-label="Previous">
                     <span aria-hidden="true">&laquo;</span>
                 </a>
             {% endif %}
         </li>
 
         <li><a href="/books/?page=1">首页</a></li>
 
         {% for item in page_list %}
             {{ item|safe }}
         {% endfor %}
 
         <li><a href="?page={{ total_page }}">尾页</a></li>
 
         <li>
             {% if page == total_page %}
               <a href="#" aria-label="Previous">
                 <span aria-hidden="true">&laquo;</span>
               </a>
             {% else %}
                 <a href="?page={{ next_page }}" aria-label="Previous">
                     <span aria-hidden="true">&raquo;</span>
                 </a>
             {% endif %}
         </li>
       </ul>
     </nav>
 </div>
 
 <script src="/static/jquery.js"></script>
 <script src="/static/bootstrap/js/bootstrap.min.js"></script>