Django 实现的分页类

后台实现的一个分页类：

 from django.utils.safestring import mark_safe

 class Page:
     def __init__(self, current_page, data_count, per_page_count=10, pager_num=7):
         self.current_page = current_page
         self.data_count = data_count
         self.per_page_count = per_page_count
         self.pager_num = pager_num

     @property
     def start(self):
         return (self.current_page - 1) * self.per_page_count

     @property
     def end(self):
         return self.current_page * self.per_page_count

     @property
     def total_count(self):
         v, y = divmod(self.data_count, self.per_page_count)
         if y:
             v += 1
         return v

     def page_str(self, base_url):
         page_list = []

         if self.total_count < self.pager_num:
             start_index = 1
             end_index = self.total_count + 1
         else:
             if self.current_page <= (self.pager_num + 1) / 2:
                 start_index = 1
                 end_index = self.pager_num + 1
             else:
                 start_index = self.current_page - (self.pager_num - 1) / 2
                 end_index = self.current_page + (self.pager_num + 1) / 2
                 if (self.current_page + (self.pager_num - 1) / 2) > self.total_count:
                     end_index = self.total_count + 1
                     start_index = self.total_count - self.pager_num + 1

         if self.current_page == 1:
             prev = '<a class="page" href="javascript:void(0);">上一页</a>'
         else:
             prev = '<a class="page" href="%s?p=%s">上一页</a>' % (base_url, self.current_page - 1,)
         page_list.append(prev)

         for i in range(int(start_index), int(end_index)):
             if i == self.current_page:
                 temp = '<a class="page active" href="%s?p=%s">%s</a>' % (base_url, i, i)
             else:
                 temp = '<a class="page" href="%s?p=%s">%s</a>' % (base_url, i, i)
             page_list.append(temp)

         if self.current_page == self.total_count:
             nex = '<a class="page" href="javascript:void(0);">下一页</a>'
         else:
             nex = '<a class="page" href="%s?p=%s">下一页</a>' % (base_url, self.current_page + 1,)
         page_list.append(nex)

         jump = """
         <input type='text'  /><a onclick='jumpTo(this, "%s?p=");'>GO</a>
         <script>
             function jumpTo(ths,base){
                 var val = ths.previousSibling.value;
                 location.href = base + val;
             }
         </script>
         """ % (base_url,)

         page_list.append(jump)

         page_str = mark_safe("".join(page_list))

         return page_str