The patch works fine on Linux but breaks test_pipes and test_sqlite on
Windows:

[1/1] test_pipes
testBadAppendOptions (test.test_pipes.SimplePipeTests) ... ok
testBadOpenMode (test.test_pipes.SimplePipeTests) ... ok
testBadPrependOptions (test.test_pipes.SimplePipeTests) ... ok
testClone (test.test_pipes.SimplePipeTests) ... ok
testEmptyPipeline1 (test.test_pipes.SimplePipeTests) ... 'cat' is not
recognized
 as an internal or external command,
operable program or batch file.
FAIL
testEmptyPipeline2 (test.test_pipes.SimplePipeTests) ... ok
testEmptyPipeline3 (test.test_pipes.SimplePipeTests) ... ok
testQuoting (test.test_pipes.SimplePipeTests) ... ok
testReadOpenSink (test.test_pipes.SimplePipeTests) ... ok
testRepr (test.test_pipes.SimplePipeTests) ... ok
testSetDebug (test.test_pipes.SimplePipeTests) ... ok
testSimplePipe1 (test.test_pipes.SimplePipeTests) ... 'tr' is not
recognized as
an internal or external command,
operable program or batch file.
FAIL
testSimplePipe2 (test.test_pipes.SimplePipeTests) ... The system cannot
find the
 file specified.
ERROR
testSimplePipe3 (test.test_pipes.SimplePipeTests) ... The system cannot
find the
 file specified.
FAIL
testWriteOpenSource (test.test_pipes.SimplePipeTests) ... ok

======================================================================
ERROR: testSimplePipe2 (test.test_pipes.SimplePipeTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "Z:\__svn__\lib\test\test_pipes.py", line 34, in testSimplePipe2
    with open(TESTFN2) as f:
IOError: [Errno 2] No such file or directory: '@test_560_tmp2'

======================================================================
FAIL: testEmptyPipeline1 (test.test_pipes.SimplePipeTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "Z:\__svn__\lib\test\test_pipes.py", line 58, in
testEmptyPipeline1
    self.assertEqual(f.read(), d)
AssertionError: '' != 'empty pipeline test COPY'
+ empty pipeline test COPY

======================================================================
FAIL: testSimplePipe1 (test.test_pipes.SimplePipeTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "Z:\__svn__\lib\test\test_pipes.py", line 26, in testSimplePipe1
    self.assertEqual(f.read(), 'HELLO WORLD #1')
AssertionError: '' != 'HELLO WORLD #1'
+ HELLO WORLD #1

======================================================================
FAIL: testSimplePipe3 (test.test_pipes.SimplePipeTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "Z:\__svn__\lib\test\test_pipes.py", line 44, in testSimplePipe3
    self.assertEqual(f.read(), 'HELLO WORLD #2')
AssertionError: '' != 'HELLO WORLD #2'
+ HELLO WORLD #2

----------------------------------------------------------------------
Ran 15 tests in 0.250s

FAILED (failures=3, errors=1)
test test_pipes failed -- multiple errors occurred

test test_sqlite crashed -- <class 'ImportError'>: No module named _sqlite3
Traceback (most recent call last):
  File "Z:\__svn__\lib\test\regrtest.py", line 948, in runtest_inner
    the_package = __import__(abstest, globals(), locals(), [])
  File "Z:\__svn__\lib\test\test_sqlite.py", line 4, in <module>
    test.support.import_module('_sqlite3', required_on=['win32'])
  File "Z:\__svn__\lib\test\support.py", line 115, in import_module
    return importlib.import_module(name)
  File "Z:\__svn__\lib\importlib\__init__.py", line 124, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "Z:\__svn__\lib\importlib\_bootstrap.py", line 822, in _gcd_import
    raise ImportError(_ERR_MSG.format(name))
ImportError: No module named _sqlite3