SPConstraint SPConstraint SPConstraint(node_tag: int, dofs: List[int]) Bases: ABC Base class for OpenSees single-point constraints. Attributes node_tag instance-attribute node_tag = node_tag dofs instance-attribute dofs = dofs tag instance-attribute tag: Optional[int] = None _owner instance-attribute _owner: Optional[object] = None Methods: to_tcl abstractmethod to_tcl() -> str Convert constraint to TCL command for OpenSees.