test_fileio.py 文件源码

def testModeStrings(self):
        # check invalid mode strings
        for mode in ("", "aU", "wU+", "rw", "rt"):
            try:
                f = _FileIO(TESTFN, mode)
            except ValueError:
                pass
            else:
                f.close()
                self.fail('%r is an invalid file mode' % mode)