      def setUp(self):
          self.old_TEMPLATE_LOADERS = settings.TEMPLATE_LOADERS
          settings.TEMPLATE_LOADERS = (
              ('django.template.loaders.cached.Loader', (
                      'django.template.loaders.filesystem.Loader',
              )
              ),
          )
      def tearDown(self):
          settings.TEMPLATE_LOADERS = self.old_TEMPLATE_LOADERS
 
</s> remove                 (3, 'Third'),
                (4, 'Fourth'),
 </s> add             (3, 'Third'),
            (4, 'Fourth'), </s> remove                 (1, 'First'),
                (2, 'Second'),
 </s> add             (1, 'First'),
            (2, 'Second'), </s> remove         return "PK = %d, base_name = %s, derived_name = %s" \
                % (self.customPK, self.base_name, self.derived_name)
 </s> add         return "PK = %d, base_name = %s, derived_name = %s" % (
            self.customPK, self.base_name, self.derived_name) </s> remove                 request.path_info, supported=self._supported_languages
 </s> add             request.path_info, supported=self._supported_languages </s> remove         bool(f.rel) if hasattr(f, 'rel') else
        isinstance(f, models.related.RelatedObject)), RelatedFieldListFilter)
 </s> add     bool(f.rel) if hasattr(f, 'rel') else
    isinstance(f, models.related.RelatedObject)), RelatedFieldListFilter)
                'django.template.loaders.filesystem.Loader',
      def setUp(self):
          self.old_TEMPLATE_LOADERS = settings.TEMPLATE_LOADERS
          settings.TEMPLATE_LOADERS = (
              ('django.template.loaders.cached.Loader', (
                'django.template.loaders.filesystem.Loader',
              )
              ),
          )
      def tearDown(self):
          settings.TEMPLATE_LOADERS = self.old_TEMPLATE_LOADERS
keep keep keep keep replace keep keep keep keep keep
 Fixed #21288 -- Fixed E126 pep8 warnings 
tests/template_tests/test_loaders.py