gh-130999: Avoid exiting the new REPL when there are non-string candidates for suggestions

Lib/test/test_pyrepl/test_pyrepl.py

@@ -1672,6 +1672,17 @@ def test_null_byte(self):
         self.assertEqual(exit_code, 0)
         self.assertNotIn("TypeError", output)
 
+    @force_not_colorized
+    def test_non_string_suggestion_candidates(self):
+        commands = ("import runpy\n"
+                    "runpy._run_module_code('blech', {0: '', 'bluch': ''}, '')\n"
+                    "exit()\n")
+
+        output, exit_code = self.run_repl(commands)
+        self.assertEqual(exit_code, 0)
+        self.assertNotIn("all elements in 'candidates' must be strings", output)
+        self.assertIn("bluch", output)
+
     def test_readline_history_file(self):
         # skip, if readline module is not available
         readline = import_module('readline')

Lib/test/test_traceback.py

@@ -4188,6 +4188,15 @@ def __dir__(self):
         self.assertNotIn("blech", actual)
         self.assertNotIn("oh no!", actual)
 
+    def test_attribute_error_with_non_string_candidates(self):
+        class T:
+            bluch = 1
+
+        instance = T()
+        instance.__dict__[0] = 1
+        actual = self.get_suggestion(instance, 'blich')
+        self.assertIn("bluch", actual)
+
     def test_attribute_error_with_bad_name(self):
         def raise_attribute_error_with_bad_name():
             raise AttributeError(name=12, obj=23)
@@ -4301,6 +4310,13 @@ def test_import_from_suggestions_underscored(self):
         self.assertIn("'_bluch'", self.get_import_from_suggestion(code, '_luch'))
         self.assertNotIn("'_bluch'", self.get_import_from_suggestion(code, 'bluch'))
 
+    def test_import_from_suggestions_non_string(self):
+        modWithNonStringAttr = textwrap.dedent("""\
+            globals()[0] = 1
+            bluch = 1
+        """)
+        self.assertIn("'bluch'", self.get_import_from_suggestion(modWithNonStringAttr, 'blech'))
+
     def test_import_from_suggestions_do_not_trigger_for_long_attributes(self):
         code = "blech = None"
 
@@ -4397,6 +4413,14 @@ def func():
         actual = self.get_suggestion(func)
         self.assertIn("'ZeroDivisionError'?", actual)
 
+    def test_name_error_suggestions_with_non_string_candidates(self):
+        def func():
+            abc = 1
+            globals()[0] = 1
+            abv
+        actual = self.get_suggestion(func)
+        self.assertIn("abc", actual)
+
     def test_name_error_suggestions_do_not_trigger_for_long_names(self):
         def func():
             somethingverywronghehehehehehe = None

Lib/traceback.py

@@ -1595,7 +1595,11 @@ def _compute_suggestion_error(exc_value, tb, wrong_name):
     if isinstance(exc_value, AttributeError):
         obj = exc_value.obj
         try:
-            d = dir(obj)
+            try:
+                d = dir(obj)
+            except TypeError:  # Attributes are unsortable, e.g. int and str
+                d = list(obj.__class__.__dict__.keys()) + list(obj.__dict__.keys())
+            d = sorted([x for x in d if isinstance(x, str)])
             hide_underscored = (wrong_name[:1] != '_')
             if hide_underscored and tb is not None:
                 while tb.tb_next is not None:
@@ -1610,7 +1614,11 @@ def _compute_suggestion_error(exc_value, tb, wrong_name):
     elif isinstance(exc_value, ImportError):
         try:
             mod = __import__(exc_value.name)
-            d = dir(mod)
+            try:
+                d = dir(mod)
+            except TypeError:  # Attributes are unsortable, e.g. int and str
+                d = list(mod.__dict__.keys())
+            d = sorted([x for x in d if isinstance(x, str)])
             if wrong_name[:1] != '_':
                 d = [x for x in d if x[:1] != '_']
         except Exception:
@@ -1628,6 +1636,7 @@ def _compute_suggestion_error(exc_value, tb, wrong_name):
             + list(frame.f_globals)
             + list(frame.f_builtins)
         )
+        d = [x for x in d if isinstance(x, str)]
 
         # Check first if we are in a method and the instance
         # has the wrong name as attribute

Misc/NEWS.d/next/Library/2025-03-09-03-13-41.gh-issue-130999.tBRBVB.rst

@@ -0,0 +1,2 @@
+Avoid exiting the new REPL and offer suggestions even if there are non-string
+candidates when errors occur.