Re: [Pyobjc-dev] 10.8, 10.9, NSDocument, TypeError, "cannot change a method"
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Re: [Pyobjc-dev] 10.8, 10.9, NSDocument, TypeError, "cannot change a method"
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From: Ronald O. <ron...@ma...> - 2013-08-29 11:38:19
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On 28 Aug, 2013, at 15:25, Erik van Blokland <er...@le...> 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
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