test_fileio.py 文件源码

def testAbles(self):
        try:
            f = _FileIO(TESTFN, "w")
            self.assertEqual(f.readable(), False)
            self.assertEqual(f.writable(), True)
            self.assertEqual(f.seekable(), True)
            f.close()

            f = _FileIO(TESTFN, "r")
            self.assertEqual(f.readable(), True)
            self.assertEqual(f.writable(), False)
            self.assertEqual(f.seekable(), True)
            f.close()

            f = _FileIO(TESTFN, "a+")
            self.assertEqual(f.readable(), True)
            self.assertEqual(f.writable(), True)
            self.assertEqual(f.seekable(), True)
            self.assertEqual(f.isatty(), False)
            f.close()

            if sys.platform != "win32":
                try:
                    f = _FileIO("/dev/tty", "a")
                except EnvironmentError:
                    # When run in a cron job there just aren't any
                    # ttys, so skip the test.  This also handles other
                    # OS'es that don't support /dev/tty.
                    pass
                else:
                    self.assertEqual(f.readable(), False)
                    self.assertEqual(f.writable(), True)
                    if sys.platform != "darwin" and \
                       'bsd' not in sys.platform and \
                       not sys.platform.startswith('sunos'):
                        # Somehow /dev/tty appears seekable on some BSDs
                        self.assertEqual(f.seekable(), False)
                    self.assertEqual(f.isatty(), True)
                    f.close()
        finally:
            os.unlink(TESTFN)