gh-105895: Add match and case to help topics

[dzherb]

• Issue: help seems to have no information on match or case #105895

---

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

• Issue: help seems to have no information on match or case #105895

[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)

[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.

[sobolevn]

I checked out this PR and tried:

I think that you need to regen pydoc-topics with: make -C Doc pydoc-topics

It might take a while.

Also, add a NEWS entry (see #132784 (comment) about how to do that) and change the issue number :) I will update you PR title for you to match the original issue #132783

[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]

@sobolevn could you please look at the last changes? Is everything ok?

[sobolevn]

LGTM, but I can't merge this PR. Since I am not an expert in pydoc and I need someone who knows how it actually works to verify :)