I filtered approximately 58 links with personal domains from the CPython documentation RST files. Nine links are missing or inaccessible, which is a high error rate.
Code
import requests
links = [
'https://learning-python.com/about-pp4e.html',
'https://adamj.eu/tech/2019/09/12/how-i-import-pythons-datetime-module/',
'https://morepypy.blogspot.com/2015/01/faster-more-memory-efficient-and-more.html',
'https://greenteapress.com/semaphores/LittleBookOfSemaphores.pdf',
'https://www.thrysoee.dk/editline/',
'https://jacobfilipp.com/DrDobbs/articles/DDJ/1988/8807/8807c/8807c.htm',
'https://old.red-dove.com/python_logging.html',
'https://www.chiark.greenend.org.uk/~sgtatham/bugs.html',
'https://www.bytereef.org/mpdecimal/doc/libmpdec/index.html',
'https://quimby.gnus.org/notes/BABYL',
'https://www.phyast.pitt.edu/~micheles/',
'https://www.boddie.org.uk/python/COM.html',
'https://support.enthought.com/hc/en-us/articles/360038600051-Canopy-GUI-end-of-life-transition-to-the-Enthought-Deployment-Manager-EDM-and-Visual-Studio-Code',
'http://lists.idyll.org/listinfo/testing-in-python',
'http://catb.org/~esr/trove/',
'https://grantjenks.com/docs/sortedcollections/',
'https://aosabook.org/en/500L/a-web-crawler-with-asyncio-coroutines.html',
'https://nbviewer.org/url/norvig.com/ipython/Probability.ipynb',
'https://allendowney.com/research/rand/downey07randfloat.pdf',
'https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT',
'https://tauday.com/',
'https://cr.yp.to/proto/maildir.html',
'http://xmlrpc.scripting.com/spec.html',
'https://rhettinger.wordpress.com/2011/01/28/open-your-source-more/',
'http://www.dabeaz.com/coroutines/index.html',
'http://www.java2s.com/Tutorial/Cpp/0380__set-multiset/Catalog0380__set-multiset.htm',
'https://www.jcea.es/programacion/pybsddb.htm',
'https://udrepper.livejournal.com/20407.html',
'https://codahale.com/a-lesson-in-timing-attacks/',
'https://nng.nanomsg.org/',
'https://invisible-island.net/ncurses/ncurses.faq.html',
'https://timgolden.me.uk/python/win32_how_do_i.html',
'https://python-notes.curiousefficiency.org/en/latest/python3/text_file_processing.html',
'http://www.catb.org/~esr/fetchmail/fetchmail-FAQ.html',
'https://invisible-island.net/ncurses/ncurses-intro.html',
'https://chaquo.com/chaquopy',
'https://www.doesjitgobrrr.com/run/2026-04-29',
'https://tukaani.org/xz/',
'https://www.joelonsoftware.com/2003/10/08/the-absolute-minimum-every-software-developer-absolutely-positively-must-know-about-unicode-and-character-sets-no-excuses/',
'https://vincent.bernat.ch/en/blog/2011-ssl-perfect-forward-secrecy',
'https://www.statisticshowto.com/probability-and-statistics/z-score/',
'http://www.indowsway.com/floatingpoint.htm',
'https://jkorpela.fi/unicode/guide.html',
'http://www.dabeaz.com/generators/',
'https://jkorpela.fi/http.html',
'https://www.nongnu.org/nmh/',
'https://tldp.org/HOWTO/XML-RPC-HOWTO/index.html',
'https://sourceware.org/libffi/',
'https://speleotrove.com/decimal/damodel.html#refnumber',
'https://www.schneier.com/wp-content/uploads/2016/02/skein.pdf',
'https://speleotrove.com/decimal/decarith.html',
'https://nbviewer.org/url/norvig.com/ipython/Economics.ipynb',
'https://nedbatchelder.com/text/unipain.html',
'https://jvns.ca/blog/2023/01/13/examples-of-floating-point-problems/',
'https://upfrontsoftware.co.za',
'https://babel.pocoo.org/',
'https://williambert.online/2011/07/how-to-unit-testing-in-django-with-mocking-and-patching/',
'https://reproducible-builds.org/'
]
print('len(links):', len(links))
for link in links:
try:
r = requests.get(link, timeout=2)
if (status := r.status_code) != 200:
print(status, link)
except requests.ConnectTimeout:
print('timeout:', link)
except Exception:
print('error:', link)
"""
timeout: https://www.phyast.pitt.edu/~micheles/
404 https://support.enthought.com/hc/en-us/articles/360038600051-Canopy-GUI-end-of-life-transition-to-the-Enthought-Deployment-Manager-EDM-and-Visual-Studio-Code
timeout: http://lists.idyll.org/listinfo/testing-in-python
404 http://xmlrpc.scripting.com/spec.html
404 http://www.java2s.com/Tutorial/Cpp/0380__set-multiset/Catalog0380__set-multiset.htm
error: https://codahale.com/a-lesson-in-timing-attacks/
403 https://www.statisticshowto.com/probability-and-statistics/z-score/
timeout: http://www.dabeaz.com/generators/
error: https://www.nongnu.org/nmh/
"""