bpo-45495: Add 'case' and 'match' to IDLE completions list

[terryjreedy]

Since the keyword list is frozen, only compute it once per
session. The colorizer already handles context keywords.

https://bugs.python.org/issue45495

[miss-islington]

Thanks @terryjreedy for the PR 🌮🎉.. I'm working now to backport this PR to: 3.10.
🐍🍒⛏🤖

[bedevere-bot]

GH-29001 is a backport of this pull request to the 3.10 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot ARM64 macOS 3.x has failed when building commit 42ac06d.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/725/builds/182) and take a look at the build logs.
4. Check if the failure is related to this commit (42ac06d) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/725/builds/182

Failed tests:

• test_importlib

Failed subtests:

• test_multiprocessing_pool_circular_import - test.test_importlib.test_threaded_import.ThreadedImportTests

Summary of the results of the build (if available):

== Tests result: FAILURE then ENV CHANGED ==

408 tests OK.

10 slowest tests:

• test_concurrent_futures: 3 min 34 sec
• test_multiprocessing_spawn: 2 min 33 sec
• test_multiprocessing_forkserver: 1 min 53 sec
• test_unparse: 1 min 28 sec
• test_asyncio: 1 min 18 sec
• test_tokenize: 1 min 17 sec
• test_logging: 1 min 3 sec
• test_lib2to3: 58.3 sec
• test_capi: 49.4 sec
• test_signal: 46.0 sec

1 test altered the execution environment:
test_ftplib

16 tests skipped:
test_devpoll test_epoll test_gdb test_ioctl test_msilib
test_multiprocessing_fork test_ossaudiodev test_spwd
test_startfile test_tix test_tk test_ttk_guionly test_winconsoleio
test_winreg test_winsound test_zipfile64

1 re-run test:
test_importlib

Total duration: 9 min 53 sec

Click to see traceback logs

Traceback (most recent call last): File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/asyncore.py", line 90, in read obj.handle_read_event() ^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_ftplib.py", line 384, in handle_read_event self._do_ssl_handshake() ^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_ftplib.py", line 345, in _do_ssl_handshake self.socket.do_handshake() ^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/ssl.py", line 1346, in do_handshake self._sslobj.do_handshake() ^^^^^^^^^^^^^^^^^^^^^^^^^^^ ssl.SSLZeroReturnError: TLS/SSL connection has been closed (EOF) (_ssl.c:998) Traceback (most recent call last): File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/resource_tracker.py", line 209, in main cache[rtype].remove(name) ^^^^^^^^^^^^^^^^^^^^^^^^^ KeyError: '/psm_2e17e032' Traceback (most recent call last): File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/threading.py", line 1031, in _bootstrap_inner self.run() ^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_ftplib.py", line 298, in run asyncore.loop(timeout=0.1, count=1) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/asyncore.py", line 214, in loop poll_fun(timeout, map) ^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/asyncore.py", line 157, in poll read(obj) ^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/asyncore.py", line 94, in read obj.handle_error() ^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_ftplib.py", line 421, in handle_error raise Exception ^^^^^^^^^^^^^^^ Exception k Traceback (most recent call last): File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_importlib/partial/pool_in_threads.py", line 9, in t with multiprocessing.Pool(1): ^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/context.py", line 119, in Pool return Pool(processes, initializer, initargs, maxtasksperchild, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/pool.py", line 212, in __init__ self._repopulate_pool() ^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/pool.py", line 303, in _repopulate_pool return self._repopulate_pool_static(self._ctx, self.Process, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/pool.py", line 326, in _repopulate_pool_static w.start() ^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/process.py", line 121, in start self._popen = self._Popen(self) ^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/context.py", line 284, in _Popen return Popen(process_obj) ^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/popen_spawn_posix.py", line 32, in __init__ super().__init__(process_obj) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/popen_fork.py", line 19, in __init__ self._launch(process_obj) ^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/popen_spawn_posix.py", line 54, in _launch child_r, parent_w = os.pipe() ^^^^^^^^^ OSError: [Errno 24] Too many open files Traceback (most recent call last): File "<string>", line 1, in <module> File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/spawn.py", line 116, in spawn_main exitcode = _main(fd, parent_sentinel) ^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/spawn.py", line 124, in _main preparation_data = reduction.pickle.load(from_parent) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ EOFError: Ran out of input Traceback (most recent call last): File "<string>", line 1, in <module> File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/spawn.py", line 116, in spawn_main exitcode = _main(fd, parent_sentinel) ^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/spawn.py", line 124, in _main preparation_data = reduction.pickle.load(from_parent) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ EOFError: Ran out of input /Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/resource_tracker.py:224: UserWarning: resource_tracker: There appear to be 114 leaked semaphore objects to clean up at shutdown warnings.warn('resource_tracker: There appear to be %d ' --- Traceback (most recent call last): File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_importlib/test_threaded_import.py", line 258, in test_multiprocessing_pool_circular_import script_helper.assert_python_ok(fn) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/support/script_helper.py", line 160, in assert_python_ok return _assert_python(True, *args, **env_vars) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/support/script_helper.py", line 145, in _assert_python res.fail(cmd_line) ^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/support/script_helper.py", line 72, in fail raise AssertionError("Process return code is %d\n" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ AssertionError: Process return code is 1 command line: ['/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/python.exe', '-X', 'faulthandler', '-I', '/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_importlib/partial/pool_in_threads.py'] Traceback (most recent call last): File "/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/multiprocessing/resource_tracker.py", line 209, in main cache[rtype].remove(name) ^^^^^^^^^^^^^^^^^^^^^^^^^ KeyError: '/psm_7e0a9c41'