gh-132783: Add match and case to help topics

[dzherb]

• Issue: No Python documentation found for 'match' #132783

---

📚 Documentation preview 📚: https://cpython-previews--132784.org.readthedocs.build/

[python-cla-bot]

All commit authors signed the Contributor License Agreement.

[bedevere-app]

Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

[dzherb]

I'm not sure if I should also commit the autogenerated topics.py

[dzherb]

This test case fails not due to unsorted keywords, but because match and case are not present in keyword.kwlist. Instead, they are listed in keyword.softkwlist, along with entries like type and _.

class TestHelper(unittest.TestCase):
    def test_keywords(self):
        self.assertEqual(sorted(pydoc.Helper.keywords),
                         sorted(keyword.kwlist))

I suggest splitting this into two separate cases:

class TestHelper(unittest.TestCase):
    def test_keywords_are_sorted(self):
        self.assertEqual(
            sorted(pydoc.Helper.keywords),
            list(pydoc.Helper.keywords),
        )

    def test_keywords_in_grammar(self):
        all_keywords = set(keyword.kwlist) | set(keyword.softkwlist)
        for kw in pydoc.Helper.keywords:
            self.assertIn(kw, all_keywords)