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Can a Key Value Dictionary Parm be set via Pyth Expression?

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This works in the python console
>>>xx = hou.parm('/obj/pathto/my_key_value_parm')

Yet If I right click on the key_value parameter - Edit Expression - Change Language to Python and enter the following

mydict = {'ex_k': 'ex_v'}
return mydict

No value is shown in the UI, and
I get an error 
Warning: Bad parameter reference: /obj/pathto/my_key_value_parm.

HouFX 19.5

Edited by AdamM

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