class Pagination(object):   """用于Model字段值的選擇"""     def __init__(self):     pass    @classmethod   def create_pagination(self, from_name='', model_name='',              cur_page=1, start_page_omit_symbol = '...',              end_page_omit_symbol = '...', one_page_data_size=10,              show_page_item_len=9):     """通過給的model和分頁參數對相關model進行分頁     Args:       from_name: 導入模塊的 from后面的參數         from {from_name} import model_name       mode_name: 需要導入的模塊名         from from_name import {model_name}       cur_page: 當前顯示的是第幾頁       start_page_omit_symbol: 超出的頁數使用怎么樣的省略號(前)         ... 2 3 4       end_page_omit_symbol: 超出的頁數使用怎么樣的省略號(后)         1 2 3 4 ...       one_page_data_size: 每一頁顯示幾行       show_page_item_len: 顯示幾個能點擊的頁數     Return:       pagination: dict           pagination = {             'objs': objs, # 需要顯示model數據             'all_obj_counts': all_obj_counts, # 一共多少行數據             'start_pos': start_pos, # 數據分頁開始的數據             'end_pos': end_pos, # 數據分頁結束的數據             'all_page': all_page, # 一共有多少頁             'cur_page': cur_page, # 當前的頁碼             'pre_page': pre_page, # 上一頁的頁碼             'next_page': next_page, # 下一頁的頁碼             'page_items': page_items, 能點擊的頁數             'start_page_omit_symbol': start_page_omit_symbol, # 開始的省略號             'end_page_omit_symbol': end_page_omit_symbol, # 結束的省略號           }      Raise: None     """     # 如果沒有輸入導入模塊需要的相關信息直接退出     if not from_name or not model_name:       return None       import_str = 'from {from_name} import {model_name}'.format(                      from_name = from_name,                      model_name = model_name)     # 導入模塊     exec import_str       start_pos = (cur_page - 1) * one_page_data_size      end_pos = start_pos + one_page_data_size        # 查找需要的model數據     find_objs_str = ('{model_name}.objects.all()'              '[{start_pos}:{end_pos}]'.format(                         model_name = model_name,                         start_pos = start_pos,                         end_pos = end_pos))     objs = eval(find_objs_str)         # 計算總共的頁數     find_objs_count_str = '{model_name}.objects.count()'.format(                         model_name = model_name)     all_obj_counts = eval(find_objs_count_str)     all_page = all_obj_counts / one_page_data_size     remain_obj = all_obj_counts % one_page_data_size     if remain_obj > 0:       all_page += 1       # 限制當前頁不能小于1和并且大于總頁數     cur_page = 1 if cur_page < 1 else cur_page     cur_page = all_page if cur_page > all_page else cur_page       # 獲得顯示頁數的最小頁     start_page = cur_page - show_page_item_len / 2     if start_page > all_page - show_page_item_len:       start_page = all_page - show_page_item_len + 1     start_page = 1 if start_page < 1 else start_page       # 獲得顯示頁數的最大頁     end_page = cur_page + show_page_item_len / 2     end_page = all_page if end_page > all_page else end_page     if end_page < show_page_item_len and all_page > show_page_item_len:       end_page = show_page_item_len       # 獲得上一頁     pre_page = cur_page - 1     pre_page = 1 if pre_page < 1 else pre_page       # 獲得下一頁     next_page = cur_page + 1     next_page = all_page if next_page > all_page else next_page       # 處理省略符，是否顯示     if start_page <= 1:       start_page_omit_symbol = ''           if end_page >= all_page:       end_page_omit_symbol = ''       # 創建能點擊的展示頁碼     page_items = range(start_page, end_page + 1)       pagination = {       'objs': objs,       'all_obj_counts': all_obj_counts,       'start_pos': start_pos,       'end_pos': end_pos,       'all_page': all_page,       'cur_page': cur_page,       'pre_page': pre_page,       'next_page': next_page,       'page_items': page_items,       'start_page_omit_symbol': start_page_omit_symbol,       'end_page_omit_symbol': end_page_omit_symbol,     }       return pagination 

<nav aria-label="Page navigation">  <ul class="pagination">   {% if pagination.cur_page != 1 %}   <li><a href="?cur_page=1" rel="external nofollow" ><<</a></li>   <li>    <a href="?cur_page={{ pagination.pre_page }}" rel="external nofollow" aria-label="Previous">     <span aria-hidden="true">«</span>    </a>   </li>   {% endif %}   {% for page_item in pagination.page_items %}   {% if page_item == pagination.cur_page %}     <li><a href="?cur_page={{ page_item }}" rel="external nofollow" rel="external nofollow" >{{ page_item }}</a></li>   {% else %}     <li><a href="?cur_page={{ page_item }}" rel="external nofollow" rel="external nofollow" >{{ page_item }}</a></li>   {% endif %}   {% endfor%}   {% if pagination.cur_page != pagination.all_page %}   <li>    <a href="?cur_page={{ pagination.next_page }}" rel="external nofollow" aria-label="Next">     <span aria-hidden="true">»</span>    </a>   </li>   <li><a href="?cur_page={{ pagination.all_page }}" rel="external nofollow" >>></a></li>   {% endif %}  </ul> </nav> 

def blogpage(request):     #ojt = BlogPost.object.all()     #p = Paginator(ojt,2)     #page_count = p.count     #page_data = p.page(page)     #template = 'blogpage.html'     #info = {'page_data':page_data,'page_count':page_count}     #return render(request,template,{'page_data':page_data,'page_count':page_count})     try:         cur_page = int(request.GET.get('cur_page', '1'))      except ValueError:         cur_page = 1      pagination = Pagination.create_pagination(              from_name='blog.models',               model_name='BlogPost',              cur_page=cur_page,              start_page_omit_symbol = '...',               end_page_omit_symbol = '...',              one_page_data_size=1,               show_page_item_len=5)     return render(request, 'blogpage.html',{'pagination':pagination})