[issue35595] Add sys flag to always show full paths in stack traces (instead of relative paths)

[Karthikeyan Singaravelan]

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


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nosy: +xtreak

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35595>
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