@unittest.skipUnless(hasattr(os, 'tmpfile'), 'test needs os.tmpfile()')
    def test_tmpfile(self):
        # As with test_tmpnam() below, the Windows implementation of tmpfile()
        # attempts to create a file in the root directory of the current drive.
        # On Vista and Server 2008, this test will always fail for normal users
        # as writing to the root directory requires elevated privileges.  With
        # XP and below, the semantics of tmpfile() are the same, but the user
        # running the test is more likely to have administrative privileges on
        # their account already.  If that's the case, then os.tmpfile() should
        # work.  In order to make this test as useful as possible, rather than
        # trying to detect Windows versions or whether or not the user has the
        # right permissions, just try and create a file in the root directory
        # and see if it raises a 'Permission denied' OSError.  If it does, then
        # test that a subsequent call to os.tmpfile() raises the same error. If
        # it doesn't, assume we're on XP or below and the user running the test
        # has administrative privileges, and proceed with the test as normal.
        with warnings.catch_warnings():
            warnings.filterwarnings("ignore", "tmpfile", DeprecationWarning)

            if sys.platform == 'win32':
                name = '\\python_test_os_test_tmpfile.txt'
                if os.path.exists(name):
                    os.remove(name)
                try:
                    fp = open(name, 'w')
                except IOError, first:
                    # open() failed, assert tmpfile() fails in the same way.
                    # Although open() raises an IOError and os.tmpfile() raises an
                    # OSError(), 'args' will be (13, 'Permission denied') in both
                    # cases.
                    try:
                        fp = os.tmpfile()
                    except __HOLE__, second:
                        self.assertEqual(first.args, second.args)
                    else:
                        self.fail("expected os.tmpfile() to raise OSError")
                    return
                else:
                    # open() worked, therefore, tmpfile() should work.  Close our
                    # dummy file and proceed with the test as normal.
                    fp.close()
                    os.remove(name)

            fp = os.tmpfile()
            fp.write("foobar")
            fp.seek(0,0)
            s = fp.read()
            fp.close()
            self.assertTrue(s == "foobar")
dataset/ETHPy150Open francelabs/datafari/windows/python/Lib/test/test_os.py/TemporaryFileTests.test_tmpfile