Before this patch it would raise an error when trying to display
documentation for a method that used annotations.

Patch by Claudiu Popa.

Patch by Antoine Pitrou (based on Robin Schreiber's original patch)

 -I

    Run Python in isolated mode. This also implies -E and -s. In isolated mode
    sys.path contains neither the script’s directory nor the user’s
    site-packages directory. All PYTHON* environment variables are ignored,
    too. Further restrictions may be imposed to prevent the user from
    injecting malicious code.

For 3.3, we just deleted the example.  In 3.4 it was fixed.

Also, document the policy keyword that was added to Message in 3.3.

This was triggered by wanting to make the doctest in email.policy.rst pass;
as_bytes and __bytes__ are clearly useful now that we have BytesGenerator.
Also updated the Message docs to document the policy keyword that was
added in 3.3.

#18581: remove duplicate test and run a test class that was skipped.  Initial patch by Vajrasky Kok.

#18273: move the tests in Lib/test/json_tests to Lib/test/test_json and make them discoverable by unittest.  Patch by Zachary Ware.