[issue31733] [2.7] Add PYTHONSHOWREFCOUNT environment variable to Python 2.7

[STINNER Victor]

Change by STINNER Victor <victor.stinner at gmail.com>:


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keywords: +patch
pull_requests: +3907
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31733>
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