自定义分页组件

class Pagination(object):
    def __init__(self,totalCount,currentPage,perPageNum=30,maxPageNum=7):
        # 数据总个数
        self.total_count=totalCount
        #     每页显示的行数
        self.per_page_item_num = perPageNum
        # 最多显示页面
        self.max_page_num = maxPageNum
        # 当前页
        try:
            v=int(currentPage)
            if v<=0:
                v=1
            self.current_page=v
        except Exception as e:
            self.current_page=1


    def start(self):
        return (self.current_page-1)*self.per_page_item_num

    def end(self):
        return self.current_page*self.per_page_item_num

    @property
    # 不加时，需要self.num_pages();加上时，可直接self.num_pages
    def num_pages(self):
    #     总页数
        a,b=divmod(self.total_count,self.per_page_item_num)
        if b==0:
            return a
        return a+1


    def pager_num_range(self):
            # self.per_page_num  最多显示的页码数量
            # num_pages:总页数

        if self.num_pages < self.max_page_num:
            return range(1, self.num_pages + 1)
            #         总页数特别多
        part = int(self.max_page_num / 2)
        if self.current_page <= part:
            return range(1, self.max_page_num+ 1)

        if (self.current_page + part) > self.num_pages:
            return range(self.num_pages - self.max_page_num + 1, self.num_pages + 1)

        return range(self.current_page - part, self.current_page + part + 1)

    def page_str(self):
        page_list=[]
        first="<a href='/index2.html?p=1'>首页</a></li>"
        page_list.append(first)
        if self.current_page==1:
            prev="<li><a href='#'>上一页</a></li>"
        else:
            prev = "<li><a href='/index2.html?p=%s'>上一页</a></li>"%(self.current_page-1,)
        page_list.append(prev)



        for i in self.pager_num_range():
            if i==self.current_page:
                temp="<li class='active'><a href='/index2.html?p=%s'>%s</a></li>"%(i,i)
            else:
                temp="<li><a href='/index2.html?p=%s'>%s</a></li>"%(i,i)
            page_list.append(temp)

        if self.current_page==self.num_pages:
            nex = "<li><a href='#'>下一页</a></li>"
        else:
            nex = "<li><a href='/index2.html?p=%s'>下一页</a></li>"%(self.current_page+1,)
        page_list.append(nex)

        last = "<li><a href='/index2.html?p=%s'>首页</a></li>"%(self.num_pages,)
        page_list.append(last)

        return ''.join(page_list)