test_marshal.py 文件源码

def test_multiple_dumps_and_loads(self):
        # Issue 12291: marshal.load() should be callable multiple times
        # with interleaved data written by non-marshal code
        # Adapted from a patch by Engelbert Gruber.
        data = (1, 'abc', b'def', 1.0, (2, 'a', ['b', b'c']))
        for interleaved in (b'', b'0123'):
            ilen = len(interleaved)
            positions = []
            try:
                with open(support.TESTFN, 'wb') as f:
                    for d in data:
                        marshal.dump(d, f)
                        if ilen:
                            f.write(interleaved)
                        positions.append(f.tell())
                with open(support.TESTFN, 'rb') as f:
                    for i, d in enumerate(data):
                        self.assertEqual(d, marshal.load(f))
                        if ilen:
                            f.read(ilen)
                        self.assertEqual(positions[i], f.tell())
            finally:
                support.unlink(support.TESTFN)