Re: 10.8, 10.9, NSDocument, TypeError, "cannot change a method"
Ronald Oussoren <[email protected]> Thu, 29 Aug 2013 13:37:58 +0200
| Newsgroups | gmane.comp.python.pyobjc.devel |
|---|---|
| Message-ID | <[email protected]> |
On 28 Aug, 2013, at 15:25, Erik van Blokland <[email protected]> wrote: > Hi > > I'm aware this is a bit of a long shot, but maybe someone recognises this issue. > > I have a python application generated with pyobjc on OSX 10.8. > - Stock python Python 2.7.2 (default, Oct 11 2012, 20:14:37) > - presumably also a stock objc 2.3.2a0, (at /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC/objc/__init__.py) > > On 10.7 and 10.8 I can get a new window when I select New from the menu. > On 10.9 (the current developer release) I get an exception, "cannot change a method" - see below. The app continues to run, but there isn't much of a traceback. > > Looking at the dump, I get the impression something goes wrong when NSDocumentController calls newDocument: My NSDocument subclass doesn't contain anything suspicious. I think I'm using up to date calls for reading and writing. Methods in my NSDocument subclass: > init > readFromURL_ofType_error_ > writeSafelyToURL_ofType_forSaveOperation_error_ > makeWindowControllers > + a couple of callbacks for menus. > > I've tested this with two independent projects, both get the same exception. > Any guesses would be welcome, thanks. The exception you're getting (``TypeError('cannot change a method')``) is raised when you try to set an instance attribute with the same name as a method, for example: :>>> from Cocoa import NSObject :>>> o = NSObject.alloc().init() :>>> o.description = 42 Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: cannot change a method This means that your document class problably has an attribute that has the same name as a method that is new in OSX 10.9. BTW. Have you tried ``objc.setVerbose(1)``? That should print more information when converting exceptions from Python to ObjC. I guess I should also change the code that raises the exception to include more information (such as the name of the attribute). Ronald > Erik > > Exception Name: OC_PythonException > Description: <type 'exceptions.TypeError'>: cannot change a method > User Info: { > "__pyobjc_exc_traceback__" = "<traceback object at 0x112ea8680>"; > "__pyobjc_exc_type__" = "<type 'exceptions.TypeError'>"; > "__pyobjc_exc_value__" = "TypeError('cannot change a method',)"; > } > > 0 CoreFoundation 0x00007fff886878ce __exceptionPreprocess + 174 > 1 libobjc.A.dylib 0x00007fff8f656f51 objc_exception_throw + 43 > 2 CoreFoundation 0x00007fff8872d619 -[NSException raise] + 9 > 3 _objc.so 0x000000010acb1366 PyObjCFFI_MakeClosure + 4418 > 4 libffi.dylib 0x00007fff91c02a1f ffi_closure_unix64_inner + 509 > 5 libffi.dylib 0x00007fff91c0211e ffi_closure_unix64 + 70 > 6 AppKit 0x00007fff888e0b0f -[NSDocumentController newDocument:] + 36 > 7 AppKit 0x00007fff88af90da -[NSApplication sendAction:to:from:] + 327 > 8 AppKit 0x00007fff88c1d548 -[NSMenuItem _corePerformAction] + 394 > 9 AppKit 0x00007fff88c1d234 -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] + 117 > 10 AppKit 0x00007fff8893e72d -[NSMenu _internalPerformActionForItemAtIndex:] + 35 > 11 AppKit 0x00007fff8893e5a5 -[NSCarbonMenuImpl _carbonCommandProcessEvent:handlerCallRef:] + 104 > 12 AppKit 0x00007fff88c16442 NSSLMMenuEventHandler + 716 > 13 HIToolbox 0x00007fff8ad8a9a4 _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 892 > 14 HIToolbox 0x00007fff8ad89f67 _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14HandlerCallRec + 385 > 15 HIToolbox 0x00007fff8ad9f4f0 SendEventToEventTarget + 40 > 16 HIToolbox 0x00007fff8add4380 _ZL18SendHICommandEventjPK9HICommandjjhPKvP20OpaqueEventTargetRefS5_PP14OpaqueEventRef + 420 > 17 HIToolbox 0x00007fff8ad7b818 SendMenuCommandWithContextAndModifiers + 59 > 18 HIToolbox 0x00007fff8ad7b7ba SendMenuItemSelectedEvent + 178 > 19 HIToolbox 0x00007fff8ad7b697 _ZL19FinishMenuSelectionP13SelectionDataP10MenuResultS2_ + 94 > 20 HIToolbox 0x00007fff8ad58d95 _ZL14MenuSelectCoreP8MenuData5PointdjPP13OpaqueMenuRefPt + 718 > 21 HIToolbox 0x00007fff8ad58261 _HandleMenuSelection2 + 446 > 22 AppKit 0x00007fff88ae8109 _NSHandleCarbonMenuEvent + 284 > 23 AppKit 0x00007fff88a13f1e _DPSNextEvent + 2170 > 24 AppKit 0x00007fff88a1328b -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 122 > 25 AppKit 0x00007fff88a0b53c -[NSApplication run] + 553 > 26 AppKit 0x00007fff889b5563 NSApplicationMain + 940 > 27 _AppKit.so 0x000000010cbfcbbe init_AppKit + 8609 > 28 Python 0x000000010ab025a9 PyEval_EvalFrameEx + 9244 > 29 Python 0x000000010ab00147 PyEval_EvalCodeEx + 1934 > 30 Python 0x000000010ab068df _PyEval_SliceIndex + 989 > 31 Python 0x000000010ab0263a PyEval_EvalFrameEx + 9389 > 32 Python 0x000000010ab00147 PyEval_EvalCodeEx + 1934 > 33 Python 0x000000010aaff9b3 PyEval_EvalCode + 54 > 34 Python 0x000000010ab3bc70 PyParser_ASTFromFile + 299 > 35 Python 0x000000010ab3bd3c PyRun_FileExFlags + 165 > 36 Python 0x000000010aafa830 _PyBuiltin_Init + 4737 > 37 Python 0x000000010ab025a9 PyEval_EvalFrameEx + 9244 > 38 Python 0x000000010ab00147 PyEval_EvalCodeEx + 1934 > 39 Python 0x000000010ab068df _PyEval_SliceIndex + 989 > 40 Python 0x000000010ab0263a PyEval_EvalFrameEx + 9389 > 41 Python 0x000000010ab00147 PyEval_EvalCodeEx + 1934 > 42 Python 0x000000010aaff9b3 PyEval_EvalCode + 54 > 43 Python 0x000000010ab3bc70 PyParser_ASTFromFile + 299 > 44 Python 0x000000010ab3bd3c PyRun_FileExFlags + 165 > 45 Python 0x000000010ab3b726 PyRun_SimpleFileExFlags + 410 > 46 Superpolator 0x000000010a988e79 main + 5965 > 47 Superpolator 0x000000010a987cad main + 1409 > 48 libdyld.dylib 0x00007fff8d81160d start + 1 > 49 ??? 0x0000000000000001 0x0 + 1 > ------------------------------------------------------------------------------ > Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! > Discover the easy way to master current and previous Microsoft technologies > and advance your career. 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