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import imp
import sys
import unittest
# Note:
# In Python 3.x, this test case is in Lib/test/test_importlib/test_util.py
class MagicNumberTests(unittest.TestCase):
"""
Test release compatibility issues relating to precompiled bytecode
"""
@unittest.skipUnless(
sys.version_info.releaselevel in ('candidate', 'final'),
'only applies to candidate or final python release levels'
)
def test_magic_number(self):
"""
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.
"""
EXPECTED_MAGIC_NUMBER = 62211
raw_magic = imp.get_magic()
actual = (ord(raw_magic[1]) << 8) + ord(raw_magic[0])
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\n"
"Changing the MAGIC_NUMBER for a maintenance release "
"requires discussion in python-dev and notification of "
"community stakeholders."
)
# PyPy uses cPython magic + 7 (see pypy/module/imp/importing.py)
EXPECTED_MAGIC_NUMBER += 7
self.assertEqual(EXPECTED_MAGIC_NUMBER, actual)#, msg)
def test_main():
from test.support import run_unittest
run_unittest(MagicNumberTests)
if __name__ == '__main__':
test_main()
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