gh-104818: Require Sphinx 6.2 to build the doc

.github/workflows/doc.yml

@@ -93,7 +93,7 @@ jobs:
     - name: 'Set up Python'
       uses: actions/setup-python@v4
       with:
-        python-version: '3.11'  # known to work with Sphinx 3.2
+        python-version: '3.11'  # known to work with Sphinx 6.2.1
         cache: 'pip'
         cache-dependency-path: 'Doc/requirements-oldest-sphinx.txt'
     - name: 'Install build dependencies'

Doc/conf.py

@@ -65,8 +65,9 @@
 # By default, highlight as Python 3.
 highlight_language = 'python3'
 
-# Minimum version of sphinx required
-needs_sphinx = '3.2'
+# Minimum version of sphinx required.
+# Sphinx 6.2 no longer uses imghdr which was removed in Python 3.13.
+needs_sphinx = '6.2'
 
 # Ignore any .rst files in the includes/ directory;
 # they're embedded in pages but not rendered individually.

Doc/requirements-oldest-sphinx.txt

@@ -7,32 +7,29 @@ blurb
 python-docs-theme>=2022.1
 
 # Generated from:
-#     pip install "Sphinx~=3.2.0" "docutils<0.17" "Jinja2<3" "MarkupSafe<2"
+#     pip install "Sphinx==6.2.0"
 #     pip freeze
 #
-# Sphinx 3.2 comes from ``needs_sphinx = '3.2'`` in ``Doc/conf.py``.
-# Docutils<0.17, Jinja2<3, and MarkupSafe<2 are additionally specified as
-# Sphinx 3.2 is incompatible with newer releases of these packages.
+# Sphinx 6.2 comes from ``needs_sphinx = '6.2'`` in ``Doc/conf.py``.
 
-Sphinx==3.2.1
 alabaster==0.7.13
 Babel==2.12.1
-certifi==2022.12.7
+certifi==2023.5.7
 charset-normalizer==3.1.0
-colorama==0.4.6
-docutils==0.16
+docutils==0.19
 idna==3.4
 imagesize==1.4.1
-Jinja2==2.11.3
-MarkupSafe==1.1.1
+Jinja2==3.1.2
+MarkupSafe==2.1.2
 packaging==23.1
 Pygments==2.15.1
-requests==2.29.0
+requests==2.31.0
 snowballstemmer==2.2.0
+Sphinx==6.2.0
 sphinxcontrib-applehelp==1.0.4
 sphinxcontrib-devhelp==1.0.2
 sphinxcontrib-htmlhelp==2.0.1
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.5
-urllib3==1.26.15
+urllib3==2.0.2

Doc/requirements.txt

@@ -6,7 +6,7 @@
 # Sphinx version is pinned so that new versions that introduce new warnings
 # won't suddenly cause build failures. Updating the version is fine as long
 # as no warnings are raised by doing so.
-sphinx==4.5.0
+sphinx==6.2.1
 
 blurb
 

Doc/tools/extensions/c_annotations.py

@@ -42,16 +42,6 @@
 }
 
 
-# Monkeypatch nodes.Node.findall for forwards compatability
-# This patch can be dropped when the minimum Sphinx version is 4.4.0
-# or the minimum Docutils version is 0.18.1.
-if docutils.__version_info__ < (0, 18, 1):
-    def findall(self, *args, **kwargs):
-        return iter(self.traverse(*args, **kwargs))
-
-    nodes.Node.findall = findall
-
-
 class RCEntry:
     def __init__(self, name):
         self.name = name

Doc/using/configure.rst

@@ -22,6 +22,8 @@ Features required to build CPython:
 
 * On Windows, Microsoft Visual Studio 2017 or later is required.
 
+* Sphinx 6.2 or newer is required to build the Python documentation.
+
 .. versionchanged:: 3.11
    C11 compiler, IEEE 754 and NaN support are now required.
    On Windows, Visual Studio 2017 or later is required.

Doc/whatsnew/3.13.rst

@@ -241,6 +241,11 @@ that may require changes to your code.
 Build Changes
 =============
 
+* Sphinx 6.2 or newer is now required to build the Python documentation.
+  Sphinx 6.2 no longer uses the :mod:`!imghdr` module which was removed in
+  Python 3.13.
+  (Contributed by Victor Stinner in :gh:`104818`.)
+
 
 C API Changes
 =============

Misc/NEWS.d/next/Build/2023-05-23-22-41-42.gh-issue-104818.8SI01U.rst

@@ -0,0 +1,2 @@
+Sphinx 6.2 or newer is now required to build the Python documentation. Patch
+by Victor Stinner.