class Page:
 page_num = 0
 total_count = 0
 tartype = ""
 total_page = 0 # 总页数
 per_page = 8 # 每页显示8篇文章
 max_page = 11 # 每页最大展示页数选项
 half_page = max_page // 2
 category = "" # 标记该链接所属分类ID，首页默认为空

 def __init__(self, page_num, total_count, tartype, category):
 """
 初始化函数：接收页码数、总数据数，计算总页码数并过滤错误页码数据
 :param page_num: 页码数
 :param total_count: 总数据数
 :param tartype: 分类值
 :param category: 所属分类ID
 """
 self.page_num = page_num
 self.total_count = total_count
 self.tartype = tartype
 self.total_page, m = divmod(self.total_count, self.per_page) # 总页码数，余数为m
 if category:
  self.category = category
 if m:
  self.total_page += 1
 if self.total_page < self.max_page:
  self.max_page = self.total_page
  self.half_page = self.max_page // 2
 # 过滤错误get数据
 if self.page_num > self.total_page:
  self.page_num = self.total_page
 elif self.page_num < 1:
  self.page_num = 1

 def data_start(self):
 return (self.page_num - 1) * self.per_page

 def data_end(self):
 return self.page_num * self.per_page

 def page_html(self):
 # 计算页数选项
 page_start = self.page_num - self.half_page
 page_end = self.page_num + self.half_page
 if page_start <= 1:
  page_start = 1
  page_end = self.max_page
 if page_end >= self.total_page:
  page_end = self.total_page
  page_start = self.total_page - self.max_page + 1
 # 计算上一页下一页选项
 if self.page_num == 1:
  last_page = self.page_num
  next_page = self.page_num + 1
 else:
  if self.page_num == self.total_page:
  last_page = self.page_num - 1
  next_page = self.page_num
  else:
  last_page = self.page_num - 1
  next_page = self.page_num + 1
 print(self.category)
 html_str_list = []
 html_str_list.append('<li><a href="/{}/" >«</a></li>'.format(self.tartype, last_page, self.category))
 for i in range(page_start, page_end + 1):
  if i == self.page_num:
  tmp = '<li><a class="active" href="/{}/" >{}</a></li>'.format(self.tartype, i, self.category, i)
  html_str_list.append(tmp)
  continue
  tmp = '<li><a href="/{}/" >{}</a></li>'.format(self.tartype, i, self.category, i)
  html_str_list.append(tmp)
 html_str_list.append('<li><a href="/{}/" >»</a></li>'.format(self.tartype, next_page, self.category))
 page_html = "".join(html_str_list)
 return page_html