page.py
'''
django内使用方式：
all_count = models.UserInfo.objects.all().count()
# path_info 当前页的url
# all_count所有用户信息的数量
# 10 一页显示的数量
page_info = PageInfo(request.GET.get('p'),10,all_count,request.path_info)
print(page_info.end())
user_list = models.UserInfo.objects.all()[page_info.start():page_info.end()]
'''

class PageInfo(object):def __init__(self,current_page,per_page_num,all_count,base_url,page_range=7):''':param current_page: 当前页:param per_page_num:  每页显示数据的条数:param all_count:  数据库用户总个数:param base_url:  生成页码标签的前缀:param page_range:  页面最多显示的页码个数'''try:current_page = int(current_page)except Exception as e:current_page = int(1)self.current_page = current_pageself.per_page_num = per_page_numself.all_count = all_counta,b = divmod(all_count,per_page_num)if b != 0:self.all_page = a + 1else:self.all_page = aself.base_url = base_urlself.page_range = page_rangedef start(self):return (self.current_page - 1)*self.per_page_numdef end(self):return self.current_page * self.per_page_numdef page_str(self):'''在HTML页面中显示页码信息:return:''''''<nav aria-label="..."><ul class="pager"><li><a href="#">Previous</a></li><li><a href="#">Next</a></li></ul></nav>'''page_list = []if self.current_page <= 1:prev = "<li><a href='#'>上一页</a></li>"else:prev = "<li><a href='%s?p=%s'>上一页</a></li>"%(self.base_url ,self.current_page - 1,)page_list.append(prev)if self.all_page <=self.page_range:start = 1end = self.all_page+1else:# 页数if self.current_page > int(self.page_range/2):if (self.current_page + int(self.page_range/2)) > self.all_page:start = self.all_page - self.page_range + 1end = self.all_page + 1else:start = self.current_page-int(self.page_range/2)end = self.current_page+int(self.page_range/2)+1else:start = 1end = self.page_range+1for i in range(start,end):if self.current_page == i:temp =  "<li class='active'><a href='%s?p=%s'>%s</a></li>" %(self.base_url,i,i)else:temp = "<li ><a href='%s?p=%s'>%s</a></li>" % (self.base_url, i, i)page_list.append(temp)if self.current_page >= self.all_page:nex = "<li><a href='#'>下一页</a></li>"else:nex = "<li><a href='%s?p=%s'>下一页</a></li>"%(self.base_url, self.current_page + 1,)page_list.append(nex)return ''.join(page_list)