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

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

Since this issue is on the thin border between "feature" and "bug fix", I would like to get the feedback of Benjamin on this change.

@Benjamin: Are you ok to make such change late in the Python 2.7 cycle, in Python 2.7.15?

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