分页代码

class PageHelper:
    def __init__(self, count, page, per_num=10, show_page=11):
        # 总数
        self.count = count
        # 当前的页码
        self.page = page
        # 每页的个数
        self.per_num = per_num
        if show_page % 2:
            self.show_page = show_page
        else:
            self.show_page = show_page + 1

        self.pagelist = []

        self.pagelist.append(" <a href='/classes?p=1'>第一页</a>")
        if page <= 1:
            self.pagelist.append(" <a href='javascript: void(0)'>上一页</a>")
        else:
            self.pagelist.append(" <a href='/classes?p={}'>上一页</a>".format(self.page - 1))

    def pagestr(self):
        startpage = 1
        endpage = 1
        step = self.show_page // 2
        # 确定分多少页
        b, r = divmod(self.count, self.per_num)
        if r:
            # 如果余数不为0,页数加1
            b += 1
        if b <= self.show_page:
            startpage = 1
            endpage = b
        elif self.page - step <= 1:
            startpage = 1
            endpage = self.show_page
        elif self.page + step >= b:
            startpage = b - self.show_page + 1
            endpage = b
        else:
            startpage = self.page - step
            endpage = self.page + step

        for i in range(startpage, endpage + 1):
            if self.page == i:
                self.pagelist.append(" <a href='/classes?p={}' style='background-color: aqua'>{}</a>".format(i, i))
            else:
                self.pagelist.append(" <a href='/classes?p={}' >{}</a>".format(i, i))

        if self.page >= b:
            self.pagelist.append(" <a href='javascript: void(0)'>下一页</a>")
        else:
            self.pagelist.append(" <a href='/classes?p={}'>下一页</a>".format(self.page + 1))
        self.pagelist.append(" <a href='/classes?p={}'>尾页</a>".format(b))

        return "".join(self.pagelist)