__init__.py 文件源码

def _load():
    global GPIO, _DRIVER, HAL_DRIVER_ID

    if not _DRIVER:
        installed_packages = pip.get_installed_distributions()
        flat_installed_packages = [package.project_name for package in installed_packages]
        known_drivers = [
            ("kervi-hal-win", "kervi.platforms.windows"),
            ("kervi-hal-linux", "kervi.platforms.linux"),
            ("kervi-hal-rpi", "kervi.platforms.raspberry"),
            ("kervi-hal-generic", "kervi.platforms.generic")
        ]
        for driver_name, module_name in known_drivers:
            if driver_name in flat_installed_packages:
                _DRIVER = importlib.import_module(module_name)
                HAL_DRIVER_ID = module_name
                GPIO = get_gpio()
                return driver_name