'Each python minor release should generally have a MAGIC_NUMBER
that does not change once the release reaches candidate status.
Once a release reaches candidate status, the value of the constant
EXPECTED_MAGIC_NUMBER in this test should be changed.
This test will then check that the actual MAGIC_NUMBER matches
the expected value for the release.
In exceptional cases, it may be required to change the MAGIC_NUMBER
for a maintenance release. In this case the change should be
discussed in python-dev. If a change is required, community
stakeholders such as OS package maintainers must be notified
in advance. Such exceptional releases will then require an
adjustment to this test case.'

@unittest.skipUnless((sys.version_info.releaselevel in ('final', 'release')), 'only    applies    to    candidate    or    final    python    release    levels')
def test_magic_number(self):

    EXPECTED_MAGIC_NUMBER = 3379
    actual = int.from_bytes(importlib.util.MAGIC_NUMBER[:2], 'little')
    msg = "To    avoid    breaking    backwards    compatibility    with    cached    bytecode    files    that    can't    be    automatically    regenerated    by    the    current    user,    candidate    and    final    releases    require    the    current        importlib.util.MAGIC_NUMBER    to    match    the    expected    magic    number    in    this    test.    Set    the    expected    magic    number    in    this    test    to    the    current    MAGIC_NUMBER    to    continue    with    the    release.\n\nChanging    the    MAGIC_NUMBER    for    a    maintenance    release    requires    discussion    in    python-dev    and    notification    of    community    stakeholders."
    self.assertEqual(EXPECTED_MAGIC_NUMBER, actual, msg)
