[issue39664] Improve test coverage for operator module

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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keywords: +patch
pull_requests: +17914
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18537

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39664>
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