[issue13177] Avoid chained exceptions in lru_cache

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

Another issue is that I want to keep the related accesses to the OrderedDict inside the "with lock" in order to avoid a race condition between the testing-for-membership step and the retrieve-the-cached-value step.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13177>
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