[issue25911] Regression: os.walk now using os.scandir() breaks bytes filenames on windows

[STINNER Victor]

STINNER Victor added the comment:

Update: test_os pass on all Windows buildbots except one!

I don't understand why the test fails on this buildbot.

http://buildbot.python.org/all/builders/AMD64%20Windows8%203.x/builds/1906/steps/test/logs/stdio

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FAIL: test_walk_bottom_up (test.test_os.BytesWalkTests)
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Traceback (most recent call last):
  File "D:\buildarea\3.x.bolen-windows8\build\lib\test\test_os.py", line 895, in test_walk_bottom_up
    self.assertEqual(len(all), 4)
AssertionError: 5 != 4

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<http://bugs.python.org/issue25911>
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