Method intersection

src/server/tasks/knowledgegraph/api.py:114–125

Set intersection. Returns (new_variable, "Observation: ...").

(self, variable1: Variable, variable2: Variable)

        return new_variable, rtn_str

    def intersection(self, variable1: Variable, variable2: Variable):
        """
        Set intersection. Returns (new_variable, "Observation: ...").
        """
        if variable1.type != variable2.type:
            raise ValueError("intersection: two variables must have the same type")
        if not isinstance(variable1, Variable) or not isinstance(variable2, Variable):
            raise ValueError("intersection: variable must be a variable")

        rtn_str = f"Observation: variable ##, which are instances of {variable1.type}"
        new_variable = Variable(variable1.type, f"(AND {variable1.program} {variable2.program})")
        return new_variable, rtn_str

    def union(self, variable1: Variable, variable2: Variable):
        """