PyObjC KernelManagement Framework

Warnings

• breaking 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.
  Fix: Upgrade Python to version 3.10 or later.
• gotcha 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.
  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.
• gotcha 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).
  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.
• gotcha 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.
  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.

Install

• pip install pyobjc-framework-kernelmanagement Install PyObjC KernelManagement

Imports

• KMUserClient

  from KernelManagement import KMUserClient

• NSObject

  from Foundation import NSObject

  Foundation is a core PyObjC framework often used alongside specific framework bindings.

Quickstart

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.

import objc
from KernelManagement import KMUserClient
from Foundation import NSObject # Core PyObjC framework

print(f"PyObjC version: {objc.__version__}")

# Verify that the KernelManagement framework's classes are accessible
# This only works on macOS systems.
if objc.platform == 'mac':
    if hasattr(KMUserClient, 'alloc'):
        print(f"KMUserClient class found from KernelManagement framework: {KMUserClient}")
        print(f"Is KMUserClient an Objective-C class? {isinstance(KMUserClient, objc.objc_class)}")
    else:
        print("KMUserClient class is available but lacks expected methods (ensure framework is loaded).")

    # A basic PyObjC interaction demonstrating the bridge with a common class
    ns_object_instance = NSObject.alloc().init()
    print(f"Created a basic NSObject instance: {ns_object_instance}")
else:
    print("PyObjC and its framework bindings are macOS-specific and cannot run on this platform.")