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FIX: do not cache exceptions - #25470
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This leads to caching the tracebacks which can keep user's objects in local namespaces alive indefinitely. This can lead to very surprising memory issues for users and will result in incorrect tracebacks. Responsive to matplotlib#25406
This is to help prevent reference cycles between the frames and the locals in that frame. While garbage collection should in most cases take care of this eventually, we can help the interpreter out and break the cycle before we return.
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Manually confirmed that the new test passes on pypy3. |
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…470-on-v3.7.x Backport PR #25470 on branch v3.7.x (FIX: do not cache exceptions)
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This leads to caching the tracebacks which can keep user's objects in local namespaces alive indefinitely. This can lead to very surprising memory issues for users and will result in incorrect tracebacks.
Responsive to #25406
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Documentation and Tests
pytestpasses)