[issue31158] test_pty: test_basic() fails randomly on Travis CI

[STINNER Victor]

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

> I prefer Cornelius’s current proposal (rev 4f8137b)

Ok, fine. I merged his PR 3852. I created backports to 2.7 and 3.6.

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versions: +Python 2.7, Python 3.6

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