[issue35283] "threading._DummyThread" redefines "is_alive" but forgets "isAlive"

[Dong-hee Na]

Change by Dong-hee Na <donghee.na92 at gmail.com>:


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pull_requests: +10931, 10932, 10933

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35283>
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