具体怎么操作？objc.loadBundle('CoreBrightness', bundle_path='/System/Library/PrivateFrameworks/CoreBrightness.framework', module_globals=globals()) def set_brightness(brightness): for screen in NSScreen.screens(): screen_brightness = CBDisplayBrightness(CGDirectDisplayID(screen.displayID())) screen_brightness.set(brightness)

这段代码是使用PyObjC库对Mac OS X的CoreBrightness.framework进行了桥接，实现了设置屏幕亮度的功能。

首先，需要确保已经安装了PyObjC库。可以使用pip命令安装：

pip install pyobjc

然后，在Python代码中导入需要用到的库和模块：

import objc
from AppKit import NSScreen
from CoreBrightness import CBDisplayBrightness

接下来，需要加载CoreBrightness.framework并定义设置屏幕亮度的函数：

objc.loadBundle('CoreBrightness', bundle_path='/System/Library/PrivateFrameworks/CoreBrightness.framework', module_globals=globals())

def set_brightness(brightness):
    for screen in NSScreen.screens():
        screen_brightness = CBDisplayBrightness(CGDirectDisplayID(screen.displayID()))
        screen_brightness.set(brightness)

在调用`set_brightness`函数时，传入一个0到1之间的浮点数，表示要设置的亮度值。例如，设置亮度为50%：

set_brightness(0.5)

注意，需要以管理员权限运行Python脚本才能修改屏幕亮度。