PyObjC 1.2 Released

PyObjC PyObjC v1.2 is now available. You can grab it from the sourceforge download page or from my idisk.

The major changes are listed below. There is some seriously cool stuff in here; new packaging, support for pure-python loadable NSBundles, categories, better bridging of complex types, and revamped examples.

  • PyObjCTools.AppHelper.stopEventLoop will attempt to stop the current
    NSRunLoop (if started by runConsoleEventLoop) or terminate the
    current NSApplication (which may or may not have been started by
  • This version no longer support Python 2.2. Python 2.3 or later is
  • It is now possible to use reload on modules containing Objective-C
  • objc.loadBundle now returns bundle we just loaded.
  • Added objc.loadBundleVariables and objc.loadBundleFunctions,
    two functions for reading global variables and functions from a bundle.
  • objc.runtime will now raise AttributeError instead of objc.nosuchclass_error
    when a class is not found.
  • objc.Category can be used to define categories on existing classes:
    class NSObject (objc.Category(NSObject)):
        def myMethod(self):

    This adds method myMethod to class NSObject.

  • py2app is now used for all Example scripts and is the recommended method
    for creating PyObjC applications.
  • Proxies of dict, list, and tuple now respect the invariant that you should
    get an identical instance if you ask for the same thing twice and the
    collection has not been mutated. This fixes some problems with binary
    plist serialization, and potentially some edge cases elsewhere.
  • There is now a __bundle_hack__ class attribute that will cause the PyObjC
    class builder to use a statically allocated class wrapper if one is
    available via certain environment variables. This functionality is used
    to enable +[NSBundle bundleForClass:] to work for exactly one class from
    a py2app-created plugin bundle.
  • We now have a working Interface Builder palette example due to
  • bool(NSNull.null()) is now false.
  • supports several new commands:
    * build_libffi
      builds libffi (used by build_ext)
    * build_html
      builds html documentation from ReST source
    * bdist_dmg
      creates a disk image with the binary installer
    * bdist_mpkg
      creates a binary installer
    * test
      runs unit test suite (replaces Scripts/runPyObjCTests
      and Scripts/runalltests)
  • PyObjCStrBridgeWarning can now be generated when Python str objects
    cross the bridge by calling objc.setStrBridgeEnabled(False). It is
    HIGHLY recommended that your application never send str objects over
    the bridge, as it is likely to cause problems due to the required
    coercion to unicode.
  • The coercion bridge from Python to Objective-C instances can now be
    augmented from Python as it is exposed by OC_PythonObject. See
    objc._bridges. This is how the str -> unicode -> NSString
    bridge with optional warnings is implemented.
  • The coercion bridge between Python objects and Objective-C structures
    can now be augmented from Python as it is exposed by OC_PythonObject.
    See objc._bridges. This is how the Carbon.File.FSRef
    <-> '{FSRef=[80c]}' structure bridge is implemented.
  • Extension modules such as _objc, _AppKit, etc. are now inside
    packages as objc._objc, AppKit._AppKit, etc. They should never be
    used directly, so this should not break user code.

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