{"id":6124,"library":"pyobjc-framework-kernelmanagement","title":"PyObjC KernelManagement Framework","description":"pyobjc-framework-kernelmanagement provides Python wrappers for the macOS KernelManagement framework. It enables Python applications to interact with kernel extensions and manage kernel-level operations on macOS. The library is part of the larger PyObjC project, currently at version 12.1, and typically releases updates aligned with macOS SDK changes and Python version support.","status":"active","version":"12.1","language":"en","source_language":"en","source_url":"https://github.com/ronaldoussoren/pyobjc","tags":["macos","objc","framework","kernel","system-management"],"install":[{"cmd":"pip install pyobjc-framework-kernelmanagement","lang":"bash","label":"Install PyObjC KernelManagement"}],"dependencies":[],"imports":[{"symbol":"KMUserClient","correct":"from KernelManagement import KMUserClient"},{"note":"Foundation is a core PyObjC framework often used alongside specific framework bindings.","symbol":"NSObject","correct":"from Foundation import NSObject"}],"quickstart":{"code":"import objc\nfrom KernelManagement import KMUserClient\nfrom Foundation import NSObject # Core PyObjC framework\n\nprint(f\"PyObjC version: {objc.__version__}\")\n\n# Verify that the KernelManagement framework's classes are accessible\n# This only works on macOS systems.\nif objc.platform == 'mac':\n    if hasattr(KMUserClient, 'alloc'):\n        print(f\"KMUserClient class found from KernelManagement framework: {KMUserClient}\")\n        print(f\"Is KMUserClient an Objective-C class? {isinstance(KMUserClient, objc.objc_class)}\")\n    else:\n        print(\"KMUserClient class is available but lacks expected methods (ensure framework is loaded).\")\n\n    # A basic PyObjC interaction demonstrating the bridge with a common class\n    ns_object_instance = NSObject.alloc().init()\n    print(f\"Created a basic NSObject instance: {ns_object_instance}\")\nelse:\n    print(\"PyObjC and its framework bindings are macOS-specific and cannot run on this platform.\")","lang":"python","description":"This quickstart demonstrates importing a class from the KernelManagement framework and verifying its Objective-C type. It also includes a basic interaction with `NSObject` from the core Foundation framework to show general PyObjC functionality. Note that `pyobjc-framework-kernelmanagement` is exclusively for macOS."},"warnings":[{"fix":"Upgrade Python to version 3.10 or later.","message":"PyObjC 12.0 dropped support for Python 3.9, and PyObjC 11.0 dropped support for Python 3.8. Ensure your Python version is 3.10 or newer.","severity":"breaking","affected_versions":">=11.0"},{"fix":"Ensure your development and deployment environment is macOS. Use platform-specific checks (e.g., `sys.platform == 'darwin'`) if your application needs to be cross-platform.","message":"PyObjC is a binding for macOS's Objective-C frameworks and is therefore exclusively available and functional on macOS. It cannot be used on Windows or Linux.","severity":"gotcha","affected_versions":"all"},{"fix":"Review Objective-C method signatures and expected ARC behavior when dealing with initializer methods, especially if you are bridging custom Objective-C code or older non-ARC patterns.","message":"PyObjC 11.1 introduced changes to align the core bridge with `clang`'s Automatic Reference Counting (ARC) documentation for initializer methods. Methods in the 'init' family now correctly model stealing a reference to `self` and returning a new reference. This can affect manual memory management (though less common in modern ARC code).","severity":"gotcha","affected_versions":">=11.1"},{"fix":"Avoid implementing `__init__` in Python subclasses of Objective-C classes if relying on PyObjC's default `__new__` behavior. If `__new__` is user-implemented, `__init__` can be used. Consult PyObjC documentation for proper class construction patterns.","message":"PyObjC 10.3 changed the interaction between `__init__` and `__new__` for Python classes bridged to Objective-C. While v10.3.1 partially re-enabled `__init__` when `__new__` is user-implemented, using `__init__` with PyObjC-provided `__new__` is still not supported.","severity":"gotcha","affected_versions":">=10.3"}],"env_vars":null,"last_verified":"2026-04-14T00:00:00.000Z","next_check":"2026-07-13T00:00:00.000Z"}