python-如果在if内

Question

我的脚本在第一个循环中寻找某些蓝牙状态标准（如果已打开，如果没有连接设备），然后睡10秒钟以允许用户更改蓝牙状态，然后在执行提示之前再次检查相同的标准。

我不明白的是，当我运行代码并在等待期（10秒）结束之前更改状态时，它仍然在第二个IF语句中运行代码。

def bluetoothLoop():
    while True:        
        def bluetooth_msg():
            BT_state = subprocess.run(['''system_profiler SPBluetoothDataType'''], shell=True, capture_output=True, encoding="utf", errors="ignore")
            BT_state = BT_state.stdout
            sound = "Blow"
            title = "TURN OFF BLUETOOTH"
            message = "Wasting energy"
            if "State: On" in BT_state and not "  Connected:" in BT_state:
                time.sleep(10)
                if "State: On" in BT_state and not "  Connected:" in BT_state:
                    command = f'''
                    osascript -e 'display notification "{message}" with title "{title}" sound name "{sound}"'
                    '''
                    os.system(command)
        bluetooth_msg()

Answer 1

您运行subprocess以在睡眠前获取BT_STATE，但您在睡眠后不会再次运行它，因此变量bt_state未更新。实际上，您正在两次检查同一件事。

我已经在下面重构了您的代码，以分开不同的作品，希望更容易看到发生了什么。

import subprocess
import time


def check_bt_status():
    output = subprocess.check_output(["system_profiler",
                                      "SPBluetoothDataType"])
    return all([b"Bluetooth Power: On" in output,
                b"Connected: Yes" not in output])
    

def show_msg(title, message, sound):
    apple_script = (f'display notification "{message}"'
                    f'with title "{title}" '
                    f'sound name "{sound}"')
    subprocess.check_output(["osascript", "-e", apple_script])


def bluetooth_loop():
    while True:
        if check_bt_status():
            show_msg("TURN OFF BLUETOOTH", "Wasting energy", "Blow")
        time.sleep(10)

if __name__ == "__main__":
    bluetooth_loop()

将BT状态逻辑放入单独的方法中意味着，如果您需要更改该逻辑，则只需要在一个地方更改它即可。

Answer 2

睡觉10秒后，您不会刷新状态。尝试，

if "State: On" in BT_state and not "  Connected:" in BT_state:
                time.sleep(10)
                BT_state = subprocess.run(['''system_profiler SPBluetoothDataType'''], shell=True, capture_output=True, encoding="utf", errors="ignore")
                BT_state = BT_state.stdout
                if "State: On" in BT_state and not "  Connected:" in BT_state:
                    command = f'''
                    osascript -e 'display notification "{message}" with title "{title}" sound name "{sound}"'
                    '''
                    os.system(command)

您甚至可以通过

def bluetoothLoop():
    BT_state = subprocess.run(['''system_profiler SPBluetoothDataType'''], shell=True, capture_output=True, encoding="utf", errors="ignore")
    BT_state = BT_state.stdout
    def bluetooth_msg():
            sound = "Blow"
            title = "TURN OFF BLUETOOTH"
            message = "Wasting energy"
            command = f'''
                    osascript -e 'display notification "{message}" with title "{title}" sound name "{sound}"'
                    '''
            os.system(command)
    while "State: On" in BT_state and not "  Connected:" in BT_state:
        bluetooth_msg()
        time.sleep(10)
        BT_state = subprocess.run(['''system_profiler SPBluetoothDataType'''], shell=True, capture_output=True, encoding="utf", errors="ignore")
        BT_state = BT_state.stdout

当心我没有运行上面的代码来清理代码，因此您可能需要对其进行一些调整。