test_fileio.py 文件源码

def testModeStrings(self):
        # test that the mode attribute is correct for various mode strings
        # given as init args
        try:
            for modes in [('w', 'wb'), ('wb', 'wb'), ('wb+', 'rb+'),
                          ('w+b', 'rb+'), ('a', 'ab'), ('ab', 'ab'),
                          ('ab+', 'ab+'), ('a+b', 'ab+'), ('r', 'rb'),
                          ('rb', 'rb'), ('rb+', 'rb+'), ('r+b', 'rb+')]:
                # read modes are last so that TESTFN will exist first
                with _FileIO(TESTFN, modes[0]) as f:
                    self.assertEqual(f.mode, modes[1])
        finally:
            if os.path.exists(TESTFN):
                os.unlink(TESTFN)