Revert "bpo-38870: Remove dependency on contextlib to avoid performance regression on import (GH-17376)"#17687
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Revert "bpo-38870: Remove dependency on contextlib to avoid performance regression on import (GH-17376)"#17687
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Commits on Dec 23, 2019
Revert "bpo-38870: Remove dependency on contextlib to avoid performance regression on import (GH-17376)"
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