On 14 September 2017 at 22:07, Ethan Furman <ethan@stoneleaf.us> wrote:

For comparison's sake, what would the above look like using __class__ assignment?  And what is the performance difference?

Actually I tried but I can't implement this without module __getattr__

so that one can just write:

from typing_extensions import allow_forward_references
allow_forward_references('Vertex', 'Edge')

Maybe I am missing something, but either it is impossible in principle or

highly non-trivial.