https://github.com/python/cpython/commit/624bf52c83abcb1f948f9059e29729fa94d38086
commit: 624bf52c83abcb1f948f9059e29729fa94d38086
branch: main
author: Maciej Olko <maciej.o...@affirm.com>
committer: hugovk <1324225+hug...@users.noreply.github.com>
date: 2025-07-15T15:26:24+03:00
summary:

gh-136155: Docs: check for EPUB fatal errors in CI (#134074)

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>

files:
A Doc/tools/check-epub.py
A Misc/NEWS.d/next/Documentation/2025-07-01-23-00-58.gh-issue-136155.4siQQO.rst
M .github/workflows/reusable-docs.yml
M Doc/conf.py

diff --git a/.github/workflows/reusable-docs.yml 
b/.github/workflows/reusable-docs.yml
index 657e0a6bf662f7..7b9dc4818577eb 100644
--- a/.github/workflows/reusable-docs.yml
+++ b/.github/workflows/reusable-docs.yml
@@ -66,7 +66,7 @@ jobs:
       run: |
         set -Eeuo pipefail
         # Build docs with the nit-picky option; write warnings to file
-        make -C Doc/ PYTHON=../python SPHINXOPTS="--quiet --nitpicky 
--fail-on-warning --warning-file sphinx-warnings.txt" html
+        make -C Doc/ PYTHON=../python SPHINXOPTS="--quiet --nitpicky 
--warning-file sphinx-warnings.txt" html
     - name: 'Check warnings'
       if: github.event_name == 'pull_request'
       run: |
@@ -75,6 +75,18 @@ jobs:
           --fail-if-regression \
           --fail-if-improved \
           --fail-if-new-news-nit
+    - name: 'Build EPUB documentation'
+      continue-on-error: true
+      run: |
+        set -Eeuo pipefail
+        make -C Doc/ PYTHON=../python SPHINXOPTS="--quiet" epub
+        pip install epubcheck
+        epubcheck Doc/build/epub/Python.epub &> Doc/epubcheck.txt
+    - name: 'Check for fatal errors in EPUB'
+      if: github.event_name == 'pull_request'
+      continue-on-error: true  # until gh-136155 is fixed
+      run: |
+        python Doc/tools/check-epub.py
 
   # Run "doctest" on HEAD as new syntax doesn't exist in the latest stable 
release
   doctest:
diff --git a/Doc/conf.py b/Doc/conf.py
index c1ed94d7b46ec2..1c1f36e5bc0737 100644
--- a/Doc/conf.py
+++ b/Doc/conf.py
@@ -448,6 +448,7 @@
 
 epub_author = 'Python Documentation Authors'
 epub_publisher = 'Python Software Foundation'
+epub_exclude_files = ('index.xhtml', 'download.xhtml')
 
 # index pages are not valid xhtml
 # https://github.com/sphinx-doc/sphinx/issues/12359
diff --git a/Doc/tools/check-epub.py b/Doc/tools/check-epub.py
new file mode 100644
index 00000000000000..693dc239c8ad58
--- /dev/null
+++ b/Doc/tools/check-epub.py
@@ -0,0 +1,24 @@
+import sys
+from pathlib import Path
+
+
+def main() -> int:
+    wrong_directory_msg = "Must run this script from the repo root"
+    if not Path("Doc").exists() or not Path("Doc").is_dir():
+        raise RuntimeError(wrong_directory_msg)
+
+    with Path("Doc/epubcheck.txt").open(encoding="UTF-8") as f:
+        messages = [message.split(" - ") for message in f.read().splitlines()]
+
+    fatal_errors = [message for message in messages if message[0] == "FATAL"]
+
+    if fatal_errors:
+        print("\nError: must not contain fatal errors:\n")
+        for error in fatal_errors:
+            print(" - ".join(error))
+
+    return len(fatal_errors)
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git 
a/Misc/NEWS.d/next/Documentation/2025-07-01-23-00-58.gh-issue-136155.4siQQO.rst 
b/Misc/NEWS.d/next/Documentation/2025-07-01-23-00-58.gh-issue-136155.4siQQO.rst
new file mode 100644
index 00000000000000..70f54936c80f55
--- /dev/null
+++ 
b/Misc/NEWS.d/next/Documentation/2025-07-01-23-00-58.gh-issue-136155.4siQQO.rst
@@ -0,0 +1 @@
+We are now checking for fatal errors in EPUB builds in CI.

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