text: 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."
          )
          self.assertEqual(EXPECTED_MAGIC_NUMBER, actual)#, msg)
  
  
  def test_main():
      from test.support import run_unittest
      run_unittest(MagicNumberTests)
  
  if __name__ == '__main__':
      test_main()
  