Hello, and thanks for your contribution!

I'm a bot set up to make sure that the project can legally accept your contribution by verifying you have signed the PSF contributor agreement (CLA).

Unfortunately we couldn't find an account corresponding to your GitHub username on bugs.python.org (b.p.o) to verify you have signed the CLA (this might be simply due to a missing "GitHub Name" entry in your b.p.o account settings). This is necessary for legal reasons before we can look at your contribution. Please follow the steps outlined in the CPython devguide to rectify this issue.

You can check yourself to see if the CLA has been received.

Thanks again for your contribution, we look forward to reviewing it!

I added a fairly simple test case with a basic custom class to test both sides of the operation and ensure a type error is only raised when both sides return NotImplemented. Please let me know if I should expand on it.

Thank you

Thanks @aiudirog for the PR, and @serhiy-storchaka for merging it 🌮🎉.. I'm working now to backport this PR to: 3.7.
🐍🍒⛏🤖

Thanks @aiudirog for the PR, and @serhiy-storchaka for merging it 🌮🎉.. I'm working now to backport this PR to: 3.8.
🐍🍒⛏🤖

I'm having trouble backporting to 3.7. Reason: 'Error 110 while writing to socket. Connection timed out.'. Please retry by removing and re-adding the needs backport to 3.7 label.

GH-15172 is a backport of this pull request to the 3.8 branch.

The 3.8 backport was languishing awaiting a merge; I manually merged it in time 3.8.0b4. I would prefer we not backport this to 3.7, given where we are in 3.7's lifecycle as the current behavior has been around for a long time.