Comment # 2 on bug 1042670 from V��t��zslav ������ek

There's an upstream bug for this issue:
https://bugs.python.org/issue30714

Fixes were committed a few days ago.
3.6:
https://github.com/python/cpython/commit/7f6a13bd562ff6a265fc63a991327feaecb07a77
2.7:
https://github.com/python/cpython/commit/05b7d9c6675b71d17f5fcf379b3888fba431f14e