gh-105194: Fix format specifier escaped characters in f-strings

[pablogsal]

• Issue: Backslash in f-string format specifier gets escape #105194

[lysnikolaou]

LGTM! Always so fast! 🔫

[miss-islington]

Thanks @pablogsal for the PR 🌮🎉.. I'm working now to backport this PR to: 3.12.
🐍🍒⛏🤖

[bedevere-bot]

GH-105234 is a backport of this pull request to the 3.12 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot ARM Raspbian 3.x has failed when building commit 41de543.

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/4135) and take a look at the build logs.
4. Check if the failure is related to this commit (41de543) 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/4135

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

== Tests result: ENV CHANGED ==

427 tests OK.

10 slowest tests:

• test_compileall: 10 min 33 sec
• test_venv: 9 min 57 sec
• test_largefile: 9 min
• test_multiprocessing_spawn: 4 min 27 sec
• test_math: 4 min 24 sec
• test_concurrent_futures: 3 min 1 sec
• test_hashlib: 2 min 34 sec
• test_regrtest: 2 min 25 sec
• test_multiprocessing_forkserver: 1 min 54 sec
• test_peg_generator: 1 min 53 sec

1 test altered the execution environment:
test.test_asyncio.test_unix_events

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

Total duration: 38 min 42 sec

Click to see traceback logs

remote: Enumerating objects: 16, done. remote: Counting objects: 6% (1/16) remote: Counting objects: 12% (2/16) remote: Counting objects: 18% (3/16) remote: Counting objects: 25% (4/16) remote: Counting objects: 31% (5/16) remote: Counting objects: 37% (6/16) remote: Counting objects: 43% (7/16) remote: Counting objects: 50% (8/16) remote: Counting objects: 56% (9/16) remote: Counting objects: 62% (10/16) remote: Counting objects: 68% (11/16) remote: Counting objects: 75% (12/16) remote: Counting objects: 81% (13/16) remote: Counting objects: 87% (14/16) remote: Counting objects: 93% (15/16) remote: Counting objects: 100% (16/16) remote: Counting objects: 100% (16/16), done. remote: Compressing objects: 7% (1/13) remote: Compressing objects: 15% (2/13) remote: Compressing objects: 23% (3/13) remote: Compressing objects: 30% (4/13) remote: Compressing objects: 38% (5/13) remote: Compressing objects: 46% (6/13) remote: Compressing objects: 53% (7/13) remote: Compressing objects: 61% (8/13) remote: Compressing objects: 69% (9/13) remote: Compressing objects: 76% (10/13) remote: Compressing objects: 84% (11/13) remote: Compressing objects: 92% (12/13) remote: Compressing objects: 100% (13/13) remote: Compressing objects: 100% (13/13), done. remote: Total 16 (delta 3), reused 9 (delta 3), pack-reused 0 
From https://github.com/python/cpython
* branch main -> FETCH_HEAD
Note: switching to '41de54378d54f7ffc38f07db4219e80f48c4249e'.
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Or undo this operation with:
git switch -
Turn off this advice by setting config variable advice.detachedHead to false
HEAD is now at 41de54378d gh-105194: Fix format specifier escaped characters in f-strings (#105231)
Switched to and reset branch 'main'
./Modules/_testcapi/heaptype_relative.c: In function ‘make_sized_heaptypes’:
./Modules/_testcapi/heaptype_relative.c:62:28: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
62 | (unsigned long long)data_ptr,
|^make: *** [Makefile:2002: buildbottest] Error 3