python之自定义分页代码模板

 1 class Pagination(object):
 2     def __init__(self, totalCount, currentPage, perPageItemNum=20, maxPageNum=7):
 3         # 数据总个数
 4         self.total_count = totalCount
 5         # 但前页
 6         try:
 7             v = int(currentPage)
 8             if v <= 0:
 9                 v = 1
10             self.current_page = v
11         except Exception as e:
12             self.current_page = 1
13         # 每页显示的行数
14         self.per_page_item_num = perPageItemNum
15         # 最多显示页面
16         self.max_page_num = maxPageNum
17 
18     def start(self):
19         return (self.current_page-1) * self.per_page_item_num
20 
21     def end(self):
22         return self.current_page * self.per_page_item_num
23     @property
24     def num_pages(self):
25         # 总页数
26         a, b = divmod(self.total_count, self.per_page_item_num)
27         if b == 0:
28             return a
29         return a + 1
30 
31     def pager_num_range(self):
32         if self.num_pages < self.max_page_num:
33             return range(1, self.num_pages + 1)
34         # 总页数特别多
35         part = int(self.max_page_num / 2)
36         if self.current_page <= part:
37             return range(1, self.max_page_num + 1)
38         if (self.current_page + part) > self.num_pages:
39             return range(self.num_pages - self.max_page_num + 1, self.num_pages + 1)
40         return range(self.current_page-part, self.current_page + part + 1)
41 
42     def page_str(self):
43         page_list = []
44         # 首页
45         page_first = '<li><a href="/index2.html?p=1">首页</a></li>'
46         page_list.append(page_first)
47         if self.current_page == 1:
48             prev = '<li><a href="#">上一页</a></li>'
49         else:
50             prev = '<li><a href="/index2.html?p=%s">上一页</a></li>' % (self.current_page - 1,)
51         page_list.append(prev)
52         for i in self.pager_num_range():
53             if i == self.current_page:
54                 temp = '<li class="active"><a href="/index2.html?p=%s">%s</a></li>' % (i, i)
55             else:
56                 temp = '<li><a href="/index2.html?p=%s">%s</a></li>' % (i, i)
57             page_list.append(temp)
58         # 如果当前页等于最后一页
59         if self.current_page == self.num_pages:
60             nex = '<li><a href="#">下一页</a>'
61         else:
62             nex = '<li><a href="/index2.html?p=%s">下一页</a></li>' % (self.current_page + 1,)
63         page_list.append(nex)
64         # 尾页
65         page_last = '<li><a href="/index2.html?p=%s">尾页</a></li>' % (self.num_pages,)
66         page_list.append(page_last)
67         return ''.join(page_list)