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Use python to check if a parameter exists


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How can I check with python if a parameter exists in a node?

There is this function on the manual but I could not make it work

def parm_exist(parmpath):
    nodepath, parmname = os.path.split(parmpath)
    node = hou.node(nodepath)
    return node.parmTuple(parmname) != None


Any tips?

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