[issue30030] Simplify _RandomNameSequence

[STINNER Victor]

STINNER Victor added the comment:


New changeset 1e62bf145b4865d03a29a5720a4eb84c321a9829 by Victor Stinner in branch 'master':
bpo-30030: Revert f50354ad (tempfile) (#1187)
https://github.com/python/cpython/commit/1e62bf145b4865d03a29a5720a4eb84c321a9829


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<http://bugs.python.org/issue30030>
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