def modifyip(tfile, deviceAddress):  # tfile为目标文件，deviceAddress为要查找的条件
    desktop_path = 'C:/Users/JiajunHu/Desktop/'  # 新创建的txt文件的存放路径
    full_path = desktop_path + deviceAddress + '.txt'  # 以deviceAddress为文件名
    try:
        lines = open(tfile, 'r', encoding='utf-8').readlines()
        flen = len(lines) - 1
        print(flen)
        for i in range(flen):
            if deviceAddress in lines[i]:
                file = open(full_path, 'a')
                file.write(lines[i - 5] + "\n" +lines[i - 4] + "\n" +
                    lines[i - 3]+ "\n" + lines[i] + "\n" + lines[i + 4])
    except Exception as e:
        print(e)


if __name__ == '__main__':
    modifyip('C:/Users/JiajunHu/Desktop/log_4.txt',
             '8akDIW5BSG0U')  # 在'C:/Users/JiajunHu/Desktop/log_4.txt'中查找'8akDIW5BSG0U'