test_tempfile.py 文件源码

def test_textmode(self):
        # _mkstemp_inner can create files in text mode
        if not has_textmode:
            return            # ugh, can't use SkipTest.

        # A text file is truncated at the first Ctrl+Z byte
        f = self.do_create(bin=0)
        f.write(b"blat\x1a")
        f.write(b"extra\n")
        os.lseek(f.fd, 0, os.SEEK_SET)
        self.assertEqual(os.read(f.fd, 20), b"blat")