[issue30283] [2.7] Backport test_regrtest (partially) on Python 2.7

[STINNER Victor]

STINNER Victor added the comment:


New changeset 453a6857023a0a2c714772cda8717ecf03de64f5 by Victor Stinner in branch '2.7':
bpo-30283: Backport regrtest features from master to 2.7 (#1516)
https://github.com/python/cpython/commit/453a6857023a0a2c714772cda8717ecf03de64f5


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