View Full Version : Python - AddConstraint

04 April 2009, 08:15 AM
I can get this to work:

Application.SIApplyConstraint("Path", newObj, oCrv)

But, this OM version won't work. I read the SDK, but don't know how to implement the fix.

newObj.Kinematics.AddConstraint("Path", oCrv)

From the SDK:
ERROR : (Python) dict can not be converted to a COM VARIANT#ERROR : Traceback (most recent call last): # File "<Script Block >", line 2, in ? # <line triggering error> # File "C:\Python23\lib\site-packages\win32comext\axscript\client\", line 150, in __getattr__ # return getattr(self._scriptItem_.dispatchContainer,attr) # File "C:\Python23\lib\site-packages\win32com\client\", line 150 in __getattr__ # raise AttributeError, "%s.%s" % (self._username_, attr) #AttributeError: line 150 Possible Cause

You may see an error like one of these accompanying a Traceback for a script block that tries to use a native Python dictionary for return value from a custom command.

Suggested Solution

You cannot use the native Python dictionary type as the return value for a custom command, but you can use an ActiveX Scripting Dictionary instead (see Using Python Dictionaries as Return Values (

04 April 2009, 05:22 AM
I think I'm figuring this out. Python doesn't think my object is a XSICollection or X3DObject or X3DObjectCollection. So, that's the problem. I duplicated an item from a collection, but didn't add the duplicate back into a collection.

Yeah, that's it.

My newObj is a duplicate. Duplicate returns a collection. doh.



04 April 2009, 07:39 AM
Fixed it yourself and actually could be arsed posting how you fixed it...
That's two cookie points right there :)

04 April 2009, 02:29 AM
I do like cookies. :)

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04 April 2009, 02:29 AM
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