django 操作分页代码实现

from django.utils.safestring import mark_safe                    #mark_safe可以使str标签变成HTML标签

class Paginstion(object):
    def __init__(self,current_page,data_count,per_page_count=6,page_num=7):
        try:
            self.current_page=int(current_page)                  #对当前页异常判断，不为负数和0
        except Exception as e:
            self.current_page=1
        self.data_count=data_count
        self.per_page_count=per_page_count
        self.page_num=page_num

    @property
    def start(self):
        return (self.current_page-1)*self.per_page_count                  #start和end为了每一页对应条数：11-20,31-40。。

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

    @property
    def total_count(self):                                                    #计算中共有多少个分页
        x,y=divmod(self.data_count,self.per_page_count)
        if y:
            x+=1
        return x
    def page_str(self,base_url):                                              #方法最后返回分页标签
        page_list=[]
        if self.total_count <self.page_num:
            start_index=1       #开始分页数字
            end_index=self.total_count+1  #结束分页数字
        else:
            if self.current_page<=(self.page_num+1)/2:     #分页处于中间位置
                start_index=1
                end_index=self.page_num+1
            else:
                start_index=self.current_page-(self.page_num-1)/2        #点击的分页数大于中间数
                end_index=self.current_page+(self.page_num+1)/2
                if (self.current_page+(self.page_num-1)/2) > self.total_count:   #点击到最后一批分页了，怎么显示
                    start_index=self.total_count-self.page_num+1
                    end_index=self.total_count
        first='<li class="page"><a href="%s?p=%s">首页</a><li>'%(base_url,1)
        page_list.append(first)
        if self.current_page==1:
            prev='<li class="page"><a href="javascript:void(0);">上一页</a><li>'
        else:
            prev='<li class="page"><a href="%s?p=%s">上一页</a><li>' %(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:
                page_item='<li class="page active"><a href="%s?p=%s">%s</a><li>' %(base_url,i,i)
            else:
                page_item = '<li class="page"><a href="%s?p=%s">%s</a><li>' % (base_url, i, i)
            page_list.append(page_item)

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

        page_list.append(next)
        last = '<li class="page"><a href="%s?p=%s">尾页</a><li>' % (base_url, self.total_count)
        page_list.append(last)
        page_star=mark_safe(''.join(page_list))
        return page_star