cc @methane

The "Tests / Check for source changes (pull_request)" CI job failed because the added NEWS entry filename contains a space in C API/ sub-directory name.

I've merged #105110 to workaround the CI error, let's update this branch.

I completed the documentation how to port existing code after reading comments of the long issue #73734.

I've merged #105110 to workaround the CI error, let's update this branch.

Thanks. To complete the doc, I rebased my PR on the main branch.

Thanks for the review @methane.

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot ARM Raspbian 3.x has failed when building commit 579c41c.

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/424/builds/4108) and take a look at the build logs.
4. Check if the failure is related to this commit (579c41c) 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/424/builds/4108

Failed tests:

• test_sqlite3

Failed subtests:

• test_interact_on_disk_file - test.test_sqlite3.test_cli.InteractiveSession.test_interact_on_disk_file

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

== Tests result: FAILURE then ENV CHANGED ==

427 tests OK.

10 slowest tests:

• test_venv: 10 min 28 sec
• test_tarfile: 9 min 43 sec
• test_largefile: 8 min 17 sec
• test_cmd_line_script: 5 min 29 sec
• test_math: 4 min 22 sec
• test_multiprocessing_spawn: 4 min 14 sec
• test_sqlite3: 3 min 30 sec
• test_exceptions: 3 min 23 sec
• test_concurrent_futures: 3 min 7 sec
• test_hashlib: 2 min 12 sec

1 test altered the execution environment:
test_concurrent_futures

19 tests skipped:
test.test_asyncio.test_windows_events
test.test_asyncio.test_windows_utils test_devpoll test_idle
test_ioctl test_kqueue test_launcher test_perf_profiler
test_startfile test_tcl test_tkinter test_ttk test_ttk_textonly
test_turtle test_winconsoleio test_winreg test_winsound test_wmi
test_zipfile64

1 re-run test:
test_sqlite3

Total duration: 41 min 25 sec

Traceback (most recent call last):
  File "/var/lib/buildbot/workers/3.x.gps-raspbian.nondebug/build/Lib/test/test_sqlite3/test_cli.py", line 142, in test_interact_on_disk_file
    out, err = proc.communicate(input="create table t(t);",
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/lib/buildbot/workers/3.x.gps-raspbian.nondebug/build/Lib/subprocess.py", line 1209, in communicate
    stdout, stderr = self._communicate(input, endtime, timeout)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/lib/buildbot/workers/3.x.gps-raspbian.nondebug/build/Lib/subprocess.py", line 2109, in _communicate
    self._check_timeout(endtime, orig_timeout, stdout, stderr)
  File "/var/lib/buildbot/workers/3.x.gps-raspbian.nondebug/build/Lib/subprocess.py", line 1253, in _check_timeout
    raise TimeoutExpired(
subprocess.TimeoutExpired: Command '['/var/lib/buildbot/workers/3.x.gps-raspbian.nondebug/build/python', '-Xutf8', '-m', 'sqlite3', '@test_21594_tmpæ']' timed out after 5.25 seconds