autodoc: fix logging of tracebacks (#13944)

Co-authored-by: Adam Turner <[email protected]>

Author: spaceone

AUTHORS.rst

@@ -56,6 +56,7 @@ Contributors
 * Etienne Desautels -- apidoc module
 * Ezio Melotti -- collapsible sidebar JavaScript
 * Filip Vavera -- napoleon todo directive
+* Florian Best -- log improvements
 * Glenn Matthews -- python domain signature improvements
 * Gregory Szorc -- performance improvements
 * Henrique Bastos -- SVG support for graphviz extension

CHANGES.rst

@@ -152,6 +152,8 @@ Bugs fixed
   Patch by Jean-François B.
 * #13916: HTML Search: do not clear text fragments from the URL on page load.
   Patch by Harmen Stoppels.
+* #13944: autodoc: show traceback during import in human readable representation.
+  Patch by Florian Best.
 
 
 Testing

sphinx/ext/autodoc/_importer.py

@@ -181,7 +181,7 @@ def _import_from_module_and_path(
             # _import_module() raises ImportError having real exception obj and
             # traceback
             real_exc = exc.args[0]
-            traceback_msg = traceback.format_exception(exc)
+            traceback_msg = ''.join(traceback.format_exception(exc))
             if isinstance(real_exc, SystemExit):
                 err_parts.append(
                     'the module executes module level statement '