Task exception was never retrieved future: <Task finished name='Task-4' coro=<download() done, defined at D:\pythonProjects\pachong\demo4\Corou_async\ex1.py:14> exception=AttributeError('__aenter__')> Traceback (most recent call last): File "D:\pythonProjects\pachong\demo4\Corou_async\ex1.py", line 15, in download async with aiohttp.ClientSession as session: AttributeError: __aenter__

这个错误是由于使用`async with aiohttp.ClientSession as session`时出错引起的。正确的用法应该是`async with aiohttp.ClientSession() as session`，即在`ClientSession()`后面添加括号。修改后的代码如下：

async def download():
    async with aiohttp.ClientSession() as session:
        # 其他异步下载的代码

这样应该就能解决这个错误了。请注意，在使用`async with`语句时，要确保所使用的对象具有`__aenter__`和`__aexit__`方法，以便正确地进入和退出上下文管理器。

相关问题

LoginDialog loginDialog ; connect(&loginDialog,&LoginDialog::sendData,this,&MainWindow::receiveData); stu = manager->getStudent(data);这个槽函数接收不到信息

这个问题可能涉及到多个方面，需要进一步的信息才能明确原因。以下是一些可能的原因和解决方案：

1. `sendData` 信号是否被正确地触发？你可以在 `LoginDialog` 类中添加一些调试语句来确保信号被正确地发出。例如：

emit sendData(data); // 发送信号
qDebug() << "Data sent: " << data; // 打印调试信息

2. `receiveData` 槽函数是否被正确地连接？你可以在 `MainWindow` 类中添加一些调试语句来确保槽函数被正确地连接。例如：

connect(&loginDialog,&LoginDialog::sendData,this,&MainWindow::receiveData);
qDebug() << "Slot function connected.";

3. `getStudent` 函数是否正确地返回 `stu` 对象？你可以在 `getStudent` 函数中添加一些调试语句来确保函数正确地返回了 `stu` 对象。例如：

Student* getStudent(Data data) {
    // ...
    qDebug() << "Student data retrieved: " << stu->name << stu->age;
    return stu;
}

4. 如果以上步骤都正确，那么可能是其他原因导致了问题。你可以添加更多的调试语句来进一步排除问题，或者将完整的代码上传到一个代码托管平台（如GitHub），并提供一个链接让我查看代码。

分析蓝牙打印”05-22 20:55:15.340 3861 3861 W ActivityThread: handleWindowVisibility: no activity for token android.os.BinderProxy@1702c5f 05-22 20:55:15.405 3861 3861 W ContextImpl: Calling a method in the system process without a qualified user: android.app.ContextImpl.sendBroadcast:1005 android.content.ContextWrapper.sendBroadcast:444 com.zhiying.bluetoothmodelservice.MainActivity.sendBroadcast:643 com.zhiying.bluetoothmodelservice.MainActivity.onCreate:84 android.app.Activity.performCreate:7136 05-22 20:55:15.409 1936 5786 E ActivityManager: Sending non-protected broadcast android.newlink.exit.bluetoothSpeaker from system 3861:com.zhiying.bluetoothmodelservice/1000 pkg com.zhiying.bluetoothmodelservice 05-22 20:55:15.419 1936 5786 E ActivityManager: Sending non-protected broadcast android.newlink.exit.bluetoothSpeaker from system 3861:com.zhiying.bluetoothmodelservice/1000 pkg com.zhiying.bluetoothmodelservice 05-22 20:55:15.491 1797 1797 I MediaPlayerFactory: [getNameByPid:285] pid(3861), cmdline task_name(com.zhiying.bluetoothmodelservice). 05-22 20:55:15.561 3861 5918 W MediaPlayerNative: info/warning (710, 20) 05-22 20:55:15.562 3861 5918 W MediaPlayerNative: info/warning (710, 40) 05-22 20:55:15.610 3861 5918 W MediaPlayerNative: info/warning (710, 80) 05-22 20:55:15.628 3861 5918 W MediaPlayerNative: info/warning (710, 90) 05-22 20:55:15.628 3861 3861 I bt.sink.btconAc: true-------service-------- 05-22 20:55:15.628 3861 5918 W MediaPlayerNative: info/warning (710, 100) 05-22 20:55:15.629 3861 3861 W ContextImpl: Calling a method in the system process without a qualified user: android.app.ContextImpl.startService:1531 android.content.ContextWrapper.startService:664 com.zhiying.bluetoothmodelservice.MainActivity.setBluetoothServiceStatus:354 com.zhiying.bluetoothmodelservice.MainActivity.initData:187 com.zhiying.bluetoothmodelservice.MainActivity.onCreate:89 05-22 20:55:15.649 3861 3861 I UartUtils: setState: true 05-22 20:55:15.649 3861 3861 I HiMW_TVClient: [invoke:53] =============invoke cmd = 0xf10a=======begin============= 05-22 20:55:15.653 3861 3861 I HiMW_TVClient: [invoke:65] =============invoke cmd = 0xf10a=======end=============== 05-22 20:55:15.654 3861 3861 W AudioManager: Use of stream types is deprecated for operations other than volume control 05-22 20:55:15.654 3861 3861 W AudioManager: See the documentation of requestAudioFocus() for what to use instead with android.media.AudioAttributes to qualify your playback use case 05-22 20:55:15.655 1936 5786 I MediaFocusControl: requestAudioFocus() from uid/pid 1000/3861 clientId=android.media.AudioManager@3140a29 callingPack=com.zhiying.bluetoothmodelservice req=2 flags=0x0 sdk=29 05-22 20:55:15.658 3861 3861 D bt.sink.btconAc: onResume: 05-22 20:55:15.658 3861 3861 D bt.sink.btconAc: getBreathingScreenDatas: Could not find remote control icon properties 05-22 20:55:15.702 3861 3861 I bt.sink.btsevice: blueToothChange:关闭 05-22 20:55:15.706 3861 3861 D BluetoothAdapter: enable(): BT already enabled! 05-22 20:55:15.738 3861 3894 I ConfigStore: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasWideColorDisplay retrieved: 0 05-22 20:55:15.738 3861 3894 I ConfigStore: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasHDRDisplay retriev

此日志中记录了一个蓝牙打印相关的应用程序的运行过程。在这个应用程序中，MainActivity被创建并且sendBroadcast()方法被调用以发送广播。然后，系统收到了这个广播并且将其发送到了一个非保护的广播中，可能会被其他应用程序接收到。MediaPlayerFactory创建了一个新的MediaPlayer实例，同时MediaPlayerNative记录了一些信息和警告。BluetoothService状态被设置为true并且HiMW_TVClient执行了一些操作。最后，AudioManager请求了音频焦点并且BluetoothAdapter被启用。