gh-152297: Polish lazy import traceback tests

Author: Kuhai9801

Lib/test/test_traceback.py

@@ -5610,7 +5610,7 @@ class TestLazyImportSuggestions(unittest.TestCase):
     """Test that lazy imports are not reified when computing AttributeError suggestions."""
 
     @staticmethod
-    def lazy_holder_script(body):
+    def _lazy_holder_script(body):
         setup = textwrap.dedent("""
             import atexit
             import os
@@ -5634,15 +5634,15 @@ def lazy_holder_script(body):
 
     def test_attribute_error_does_not_reify_lazy_imports(self):
         """Printing an AttributeError should not trigger lazy import reification."""
-        code = self.lazy_holder_script("""
+        code = self._lazy_holder_script("""
             lazy_holder.nonexistent
         """)
         rc, stdout, stderr = assert_python_failure('-c', code)
         self.assertNotIn(b"BAR_MODULE_LOADED", stdout)
 
     def test_traceback_formatting_does_not_reify_lazy_imports(self):
         """Formatting a traceback should not trigger lazy import reification."""
-        code = self.lazy_holder_script("""
+        code = self._lazy_holder_script("""
             import traceback
             try:
                 lazy_holder.nonexistent
@@ -5656,7 +5656,7 @@ def test_traceback_formatting_does_not_reify_lazy_imports(self):
 
     def test_suggestion_still_works_for_non_lazy_attributes(self):
         """Suggestions should still work for non-lazy module attributes."""
-        code = self.lazy_holder_script("""
+        code = self._lazy_holder_script("""
             lazy_holder.__nme__
         """)
         rc, stdout, stderr = assert_python_failure('-c', code)