ERROR: Invalid value `None` in intersphinx_mapping['http://docs.python.org/']. Expected a two-element tuple or list.

[florianernst]

Hello everyone,

the documentation fails to build with Sphinx 8 due to intersphinx_mapping now being structured differently, cf. intersphinx_mapping documentation.

With the current value a build fails along the lines of

Running Sphinx v8.1.3
loading translations [en]... done
making output directory... done
Converting `source_suffix = '.rst'` to `source_suffix = {'.rst': 'restructuredtext'}`.
ERROR: Invalid value `None` in intersphinx_mapping['http://docs.python.org/']. Expected a two-element tuple or list.

Configuration error:
Invalid `intersphinx_mapping` configuration (1 error).

whereas a tiny adjustment like

--- pyte-0.8.0.orig/docs/conf.py
+++ pyte-0.8.0/docs/conf.py
@@ -176,7 +176,7 @@ else:
 htmlhelp_basename = 'pytedoc'

 # Example configuration for intersphinx: refer to the Python standard library.
-intersphinx_mapping = {'http://docs.python.org/': None}
+intersphinx_mapping = {'python': ('https://docs.python.org/3', None)}

 autodoc_member_order = 'bysource'
 todo_include_todos = True

allows the documentation to build again with Sphinx 8.

Yes, the above diff references pyte-0.8.0, but the current version at https://github.com/selectel/pyte/blob/master/docs/conf.py#L215 looks just the same.

HTH,
Flo