code: def visit_subscript(self, node, parent):
          
          context = self._get_context(node)
          newnode = nodes.Subscript(
              ctx=context, lineno=node.lineno, col_offset=node.col_offset, parent=parent
          )
          newnode.postinit(
              self.visit(node.value, newnode), self.visit(node.slice, newnode)
          )
          return newnode
docs: visit a Subscript node by returning a fresh instance of it