          with self.assertRaisesMessage(ImproperlyConfigured, msg):
              path(r'hello/<int:1>/', lambda r: None)
  
      def test_allows_non_ascii_but_valid_identifiers(self):
          # \u0394 is "GREEK CAPITAL LETTER DELTA", a valid identifier.
          p = path('hello/<str:\u0394>/', lambda r: None)
          match = p.resolve('hello/1/')
 
</s> remove     def test_non_identifier_parameter_name_causes_exception(self):
 </s> add     def test_integer_parameter_name_causes_exception(self): </s> remove     path(r'(?P<named-group>\d+)', lambda x: x),
 </s> add     path(r'(?P<named_group>\d+)', lambda x: x), </s> remove         expected_msg = "Your URL pattern '(?P<named-group>\\d+)' has a route"
 </s> add         expected_msg = "Your URL pattern '(?P<named_group>\\d+)' has a route" </s> remove     r'<(?:(?P<converter>[^>:]+):)?(?P<parameter>\w+)>'
 </s> add     r'<(?:(?P<converter>[^>:]+):)?(?P<parameter>[^>]+)>' </s> remove         'sitemaps/kml/<label>/<<model>/<field_name>.kmz',
 </s> add         'sitemaps/kml/<label>/<model>/<field_name>.kmz',
    def test_non_identifier_parameter_name_causes_exception(self):
        msg = (
            "URL route 'b/<int:book.id>/' uses parameter name 'book.id' which "
            "isn't a valid Python identifier."
        )
        with self.assertRaisesMessage(ImproperlyConfigured, msg):
            path(r'b/<int:book.id>/', lambda r: None)

          with self.assertRaisesMessage(ImproperlyConfigured, msg):
              path(r'hello/<int:1>/', lambda r: None)
  
    def test_non_identifier_parameter_name_causes_exception(self):
        msg = (
            "URL route 'b/<int:book.id>/' uses parameter name 'book.id' which "
            "isn't a valid Python identifier."
        )
        with self.assertRaisesMessage(ImproperlyConfigured, msg):
            path(r'b/<int:book.id>/', lambda r: None)

      def test_allows_non_ascii_but_valid_identifiers(self):
          # \u0394 is "GREEK CAPITAL LETTER DELTA", a valid identifier.
          p = path('hello/<str:\u0394>/', lambda r: None)
          match = p.resolve('hello/1/')
keep keep add keep keep keep keep
 Fixed #31459 -- Fixed handling invalid indentifiers in URL path conversion.

This patch adjusted existing tests that used invalid identifiers. 
tests/urlpatterns/tests.py