hou.Parm.lock method
If 'on' is True, then this method locks the parameter making its value non-editable. Otherwise, this method unlocks the parameter.
lock(self, on)
If 'on' is True, then this method locks the parameter making its value non-editable. Otherwise, this method unlocks the parameter.
This function throws a hou.ObjectWasDeleted exception if called on a node that no longer exists in Houdini, or a hou.Permission exception if called on a parameter that is part of a locked digital asset.
Replaces: chlock
