test_tempfile.py 文件源码

def test_text_mode(self):
        # Creating a SpooledTemporaryFile with a text mode should produce
        # a file object reading and writing (Unicode) text strings.
        f = tempfile.SpooledTemporaryFile(mode='w+', max_size=10)
        f.write("abc\n")
        f.seek(0)
        self.assertEqual(f.read(), "abc\n")
        f.write("def\n")
        f.seek(0)
        self.assertEqual(f.read(), "abc\ndef\n")
        f.write("xyzzy\n")
        f.seek(0)
        self.assertEqual(f.read(), "abc\ndef\nxyzzy\n")
        # Check that Ctrl+Z doesn't truncate the file
        f.write("foo\x1abar\n")
        f.seek(0)
        self.assertEqual(f.read(), "abc\ndef\nxyzzy\nfoo\x1abar\n")