python分页查询数据处理方法

python分页查询数据处理方法

def view_per_data(page_num, per_page_data):
    '''
    获取指定页码的数据
    :param page_num: 页码
    :param per_page_data: 每页数据
    :return:
    '''
    page_num = int(page_num)
    per_page_data = int(per_page_data)
    view_data = []
    view_data_count = 0
    file_data = open('test.txt',mode='r',encoding='utf-8')
    stat_index = (page_num - 1) * per_page_data
    end_index = page_num * per_page_data
    for line in file_data:
        if stat_index <= view_data_count < end_index:
            view_data.append(line.strip())
        if view_data_count >= end_index:
            break
        view_data_count += 1

    return view_data

def news_title(page_num, per_page_data):
    '''
    指定页码数据展示处理
    :param page_num: 页码
    :param per_page_data: 每页数据
    :return:
    '''
    news_list = view_per_data(page_num, per_page_data)
    index = (page_num - 1) * per_page_data + 1 #起始id
    #处理数据展示指定数据内容和数据下标
    for num, line in enumerate(news_list, index):
        data = line.strip().split(',')[1]
        print(f'{num} {data}')


def execute_view():
    '''
    执行指定页码数据查看操作
    :return:
    '''
    per_page_data = 10
    page_count = 999
    # 计算页码最大值
    max_page_num, remainder = divmod(page_count, per_page_data)
    if remainder:
        max_page_num += 1
    while True:
        num = input(f'请输入页码,页码范围{0}~{max_page_num}:').strip()
        if num.isdigit():
            num = int(num)
            if num > max_page_num or num < 1:
                continue
            news_title(num, per_page_data)
        if num == 'Q':
            break