[issue40886] Add PYTHONLOGGING environment variable and -L cmdline argument

[Karthikeyan Singaravelan]

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


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nosy: +vinay.sajip

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40886>
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