[issue29849] fix memory in import_from

Changes by Xiang Zhang : -- pull_requests: +632 ___ Python tracker ___ ___ Python-bugs-list

[issue29849] fix memory in import_from

New submission from Xiang Zhang: import_from suffer from memory leak since #29546. Propose a PR to fix it. :-) -- messages: 289825 nosy: barry, brett.cannon, mbussonn, xiang.zhang priority: normal severity: normal stage: patch review status: open title: fix memory in import_from