python web框架中实现原生分页

#!/usr/bin/env python# -*- coding:utf-8 -*-  class Pagination:  def __init__(self, p, all_count, pre=10, max_show=11): ''' :param p: 当前页码 :param all_count: 数据总条数 :param pre: 每页数据量 :param max_show: 最多页码数 ''' try: self.p = int(p) # 传进来的页码 if self.p <= 0: self.p = 1 except Exception as e: self.p = 1  # 总量 # all_count = all_count # pre = per # 每页数据条数 total_num, more = divmod(all_count, pre) if more: total_num += 1 # total_num总数据页数  # 显示页码数 max_show = max_show if total_num <= max_show: # 总数据量很小 page_start = 1 page_end = total_num else: if self.p - max_show // 2 <= 0: # 防止左边出现0页 page_start = 1 page_end = max_show  elif self.p + max_show // 2 >= total_num + 1: # 防止右边出现超出 page_end = total_num page_start = page_end - max_show else: page_start = self.p - max_show // 2 page_end = self.p + max_show // 2  # 数据的起始结束 self.start = (self.p - 1) * pre self.end = self.p * pre  # 页码 self.page_start = page_start self.page_end = page_end self.total_num = total_num  @property def page_html(self): li_list = [] for i in range(self.page_start, self.page_end + 1): if i == self.p: li_list.append('<li class="active"><a href="?p={}" >{}</a></li>'.format(i, i)) else: li_list.append('<li><a href="?p={}" >{}</a></li>'.format(i, i))  # 添加页首 页尾  li_list.insert(0,  '<li><a href="?p={}" aria-label="Previous"><span aria-hidden="true">«</span></a></li>'.format(  self.p - 1)) li_list.append( '<li><a href="?p={}" aria-label="Next"><span aria-hidden="true">»</span> </a></li>'.format(self.p + 1))  if self.p == 1: li_list[0] = '<li class="disabled"><span aria-hidden="true">«</span></li>' elif self.p == self.total_num: li_list[-1] = '<li class="disabled"><span aria-hidden="true">»</span></li>'  pagehtml = ''.join(li_list) return pagehtml