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CHOP attributes and Python

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With VEX in Chops, we can set custom attributes to a clip/channel/sample. These are similar to point/vertex/prim/detail Geometry attributes. But please, can I read those CHOP attributes with Python? It seems that I can only read values of the hou.Track. The vex functions are chattr() and chsetattr()

https://www.sidefx.com/docs/houdini/vex/functions/chattr
https://www.sidefx.com/docs/houdini/vex/functions/chsetattr.html

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It seems that I have to abandon VEX in this case, and do it only with python and Node.userData()

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