Minor test improvements/refactoring

Lib/test/datetimetester.py

@@ -2125,6 +2125,7 @@ def test_fromisocalendar_type_errors(self):
                     self.theclass.fromisocalendar(*isocal)
 
     def test_strftime_strptime_roundtrip_concerning_locale_specific_year(self):
+        # gh-124529
         concerned_formats = '%c', '%x'
 
         def run_subtest():
@@ -2138,38 +2139,40 @@ def run_subtest():
                 try:
                     parsed = self.theclass.strptime(formatted, fmt)
                 except ValueError as exc:
-                    # gh-124529
                     self.fail(f"{fail_msg}; parsing error: {exc!r}")
                 self.assertEqual(parsed, expected, fail_msg)
 
-        sample = self.theclass.strptime(f'1999-03-17', '%Y-%m-%d')
+        sample = self.theclass.strptime('1999', '%Y')
         for fmt in concerned_formats:
             with self.subTest(fmt=fmt):
                 sample_str = sample.strftime(fmt)
                 if '1999' in sample_str:
                     for year in [
-                        1, 9, 10, 99, 100, 999,  # <- gh-124529
                         1000, 1410, 1989, 2024, 2095, 9999,
+                        # gh-124529:
+                        1, 9, 10, 99, 100, 999,
                     ]:
                         run_subtest()
                 elif '99' in sample_str:
                     for year in [
-                        1969, 1999,
-                        2000, 2001, 2009,  # <- gh-124529
-                        2068,
+                        1969, 1999, 2068,
+                        # gh-124529:
+                        2000, 2001, 2009,
                     ]:
                         run_subtest()
                 else:
-                    self.fail(f"it seems that {sample.strftime(fmt)=} "
-                              f"does not include year={sample.year!r} in "
-                              f"any expected format (is there something "
-                              f"severely wrong with current locale?)")
+                    self.fail(f"it seems that sample.strftime({fmt!r})="
+                              f"{sample_str!r} does not include year="
+                              f"{sample.year!r} in any expected format "
+                              f"(is there something severely wrong with "
+                              f"current locale?)")
 
     def test_strptime_accepting_locale_specific_year_with_fewer_digits(self):
+        # gh-124529
         concerned_formats = '%c', '%x'
 
         def run_subtest():
-            input_str = sample_str.replace(sample_digits, year_digits)
+            input_str = sample_str.replace(sample_year_digits, year_digits)
             reason = (f"test strptime accepting locale-specific "
                       f"year representation with fewer digits "
                       f"- for {fmt=} and {input_str=} ({year=})")
@@ -2179,27 +2182,27 @@ def run_subtest():
                 try:
                     parsed = self.theclass.strptime(input_str, fmt)
                 except ValueError as exc:
-                    # gh-124529
                     self.fail(f"{fail_msg}; parsing error: {exc!r}")
                 self.assertEqual(parsed, expected, fail_msg)
 
-        sample = self.theclass.strptime(f'1999-03-17', '%Y-%m-%d')
+        sample = self.theclass.strptime('1999', '%Y')
         for fmt in concerned_formats:
             with self.subTest(fmt=fmt):
                 sample_str = sample.strftime(fmt)
-                if (sample_digits := '1999') in sample_str:
+                if (sample_year_digits := '1999') in sample_str:
                     for year in [1, 9, 10, 99, 100, 999]:
                         year_digits = str(year)
                         run_subtest()
-                elif (sample_digits := '99') in sample_str:
+                elif (sample_year_digits := '99') in sample_str:
                     for year in [2000, 2001, 2009]:
                         year_digits = str(year - 2000)
                         run_subtest()
                 else:
-                    self.fail(f"it seems that {sample.strftime(fmt)=} "
-                              f"does not include year={sample.year!r} in "
-                              f"any expected format (is there something "
-                              f"severely wrong with current locale?)")
+                    self.fail(f"it seems that sample.strftime({fmt!r})="
+                              f"{sample_str!r} does not include year="
+                              f"{sample.year!r} in any expected format "
+                              f"(is there something severely wrong with "
+                              f"current locale?)")
 
 
 #############################################################################