    def visit_BinOp(self, node):
        op = BIN_OPS.get(node.op.__class__)
        if op:
            return op(self.visit(node.left), self.visit(node.right))
        else:
            raise InvalidNode('illegal operator %s' % node.op.__class__.__name__)
The software constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.