分頁方法需要參數(當前頁數,總數據量,拿到query的值)

class Pagination:
    def __init__(self, page_num, all_count ,params=None,per_num=10,max_show=11):
        """
           :param page_num:  當前的頁碼數
           :param all_count: 總數據量
           :param per_num:   每頁顯示的數據條數
           :param max_show:  最大顯示頁碼數
           :param self.total_page_num:  總頁碼數
           :param self.page_start:  起始頁碼數
           :param self.page_end:    終止頁碼數

        """
        try:
            page_num = int(page_num)
            if page_num <=0:
                page_num = 1
        except Exception as e:
            page_num = 1
        self.parmas = params if params else QueryDict(mutable=True)
        self.page_num = page_num
        self.all_count = all_count
        self.per_num = per_num
        total_page_num, more = divmod(all_count,per_num)
        if more:
            total_page_num+=1
        half_show = max_show//2
        # 總頁碼數不足以滿足最大頁碼數
        if total_page_num < max_show:
            page_start = 1
            page_end = total_page_num
        else:
            if page_num-half_show<=0:
                page_start =1
                page_end = max_show
            elif page_num+half_show>total_page_num:
                page_start = total_page_num-max_show+1
                page_end = total_page_num
            else:
                page_start = page_num - half_show
                page_end = page_num + half_show
        self.page_start=page_start
        self.page_end=page_end
        self.total_page_num = total_page_num
        print(self.parmas.urlencode())
    @property
    def page_html(self):
        page_list = []
        if self.page_num == 1:
            page_list.append('<li class="disabled"><a ><span>&laquo;</span></a></li>')
        else:
            self.parmas['page'] = self.page_num - 1
            print(self.parmas.urlencode())
            page_list.append('<li><a href="?{}" ><span>&laquo;</span></a></li>'.format(self.parmas.urlencode()))
        for i in range(self.page_start,self.page_end + 1):
            self.parmas['page'] = i
            if i == self.page_num:
                page_list.append('<li class="active"><a href="?{}">{}</a></li>'.format(self.parmas.urlencode(), i))
            else:
                page_list.append('<li><a href="?{}">{}</a></li>'.format(self.parmas.urlencode(), i))

        if self.page_num == self.total_page_num:
            page_list.append('<li class="disabled"><a><span>&raquo;</span></a></li>')
        else:
            self.parmas['page'] = self.page_num + 1
            page_list.append('<li><a href="?{}" ><span>&raquo;</span></a></li>'.format(self.parmas.urlencode()))

        return ''.join(page_list)
    @property
    def start(self):
        return (self.page_num - 1)* self.per_num

    @property
    def end(self):
        return self.page_num * self.per_num