Commit

Author: StanFromIreland

Lib/traceback.py

@@ -1107,11 +1107,13 @@ def __init__(self, exc_type, exc_value, exc_traceback, *, limit=None,
             suggestion = _compute_suggestion_error(exc_value, exc_traceback, wrong_name)
             if suggestion:
                 self._str += f". Did you mean: '{suggestion}'?"
-        elif exc_type and issubclass(exc_type, ModuleNotFoundError) and \
-                sys.flags.no_site and \
-                getattr(exc_value, "name", None) not in sys.stdlib_module_names:
-            self._str += (". Site initialization is disabled, did you forget to "
-                + "add the site-packages directory to sys.path?")
+        elif exc_type and issubclass(exc_type, ModuleNotFoundError):
+            module_name = getattr(exc_value, "name", None)
+            if sys.flags.no_site and module_name not in sys.stdlib_module_names:
+                self._str += (". Site initialization is disabled, did you forget to "
+                    + "add the site-packages directory to sys.path?")
+            elif module_name in sys.stdlib_module_names:
+                self._str = f"Standard library module '{module_name}' was not found"
         elif exc_type and issubclass(exc_type, (NameError, AttributeError)) and \
                 getattr(exc_value, "name", None) is not None:
             wrong_name = getattr(exc_value, "name", None)