diff --git a/AUTHORS b/AUTHORS
index 89cdf68b168..02c312e4ca1 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -624,6 +624,7 @@ answer newbie questions, and generally made Django that much better:
     Radek Švarz <http://www.svarz.cz/translate/>
     Rajesh Dhawan <rajesh.dhawan@gmail.com>
     Ramez Ashraf <ramezashraf@gmail.com>
+    Ramin Farajpour Cami <ramin.blackhat@gmail.com>
     Ramiro Morales <ramiro@rmorales.net>
     Ram Rachum <ram@rachum.com>
     Randy Barlow <randy@electronsweatshop.com>
diff --git a/django/contrib/admin/options.py b/django/contrib/admin/options.py
index 33daf244f09..12487dcc9bb 100644
--- a/django/contrib/admin/options.py
+++ b/django/contrib/admin/options.py
@@ -340,11 +340,11 @@ class BaseModelAdmin(six.with_metaclass(forms.MediaDefiningClass)):
         # Check FKey lookups that are allowed, so that popups produced by
         # ForeignKeyRawIdWidget, on the basis of ForeignKey.limit_choices_to,
         # are allowed to work.
-        for l in model._meta.related_fkey_lookups:
+        for fk_lookup in model._meta.related_fkey_lookups:
             # As ``limit_choices_to`` can be a callable, invoke it here.
-            if callable(l):
-                l = l()
-            for k, v in widgets.url_params_from_lookup_dict(l).items():
+            if callable(fk_lookup):
+                fk_lookup = fk_lookup()
+            for k, v in widgets.url_params_from_lookup_dict(fk_lookup).items():
                 if k == lookup and v == value:
                     return True
 
diff --git a/django/contrib/gis/gdal/datasource.py b/django/contrib/gis/gdal/datasource.py
index e9d588e285e..adb32a07843 100644
--- a/django/contrib/gis/gdal/datasource.py
+++ b/django/contrib/gis/gdal/datasource.py
@@ -100,16 +100,16 @@ class DataSource(GDALBase):
     def __getitem__(self, index):
         "Allows use of the index [] operator to get a layer at the index."
         if isinstance(index, six.string_types):
-            l = capi.get_layer_by_name(self.ptr, force_bytes(index))
-            if not l:
+            layer = capi.get_layer_by_name(self.ptr, force_bytes(index))
+            if not layer:
                 raise OGRIndexError('invalid OGR Layer name given: "%s"' % index)
         elif isinstance(index, int):
             if index < 0 or index >= self.layer_count:
                 raise OGRIndexError('index out of range')
-            l = capi.get_layer(self._ptr, index)
+            layer = capi.get_layer(self._ptr, index)
         else:
             raise TypeError('Invalid index type: %s' % type(index))
-        return Layer(l, self)
+        return Layer(layer, self)
 
     def __len__(self):
         "Returns the number of layers within the data source."
diff --git a/django/db/migrations/loader.py b/django/db/migrations/loader.py
index ce6fd9e3c07..bbbde07a984 100644
--- a/django/db/migrations/loader.py
+++ b/django/db/migrations/loader.py
@@ -129,9 +129,9 @@ class MigrationLoader(object):
         "Returns the migration(s) which match the given app label and name _prefix_"
         # Do the search
         results = []
-        for l, n in self.disk_migrations:
-            if l == app_label and n.startswith(name_prefix):
-                results.append((l, n))
+        for migration_app_label, migration_name in self.disk_migrations:
+            if migration_app_label == app_label and migration_name.startswith(name_prefix):
+                results.append((migration_app_label, migration_name))
         if len(results) > 1:
             raise AmbiguityError(
                 "There is more than one migration for '%s' with the prefix '%s'" % (app_label, name_prefix)
diff --git a/django/template/smartif.py b/django/template/smartif.py
index ee062d537d7..d0cebadc011 100644
--- a/django/template/smartif.py
+++ b/django/template/smartif.py
@@ -152,15 +152,15 @@ class IfParser(object):
 
     def __init__(self, tokens):
         # Turn 'is','not' and 'not','in' into single tokens.
-        l = len(tokens)
+        num_tokens = len(tokens)
         mapped_tokens = []
         i = 0
-        while i < l:
+        while i < num_tokens:
             token = tokens[i]
-            if token == "is" and i + 1 < l and tokens[i + 1] == "not":
+            if token == "is" and i + 1 < num_tokens and tokens[i + 1] == "not":
                 token = "is not"
                 i += 1  # skip 'not'
-            elif token == "not" and i + 1 < l and tokens[i + 1] == "in":
+            elif token == "not" and i + 1 < num_tokens and tokens[i + 1] == "in":
                 token = "not in"
                 i += 1  # skip 'in'
             mapped_tokens.append(self.translate_token(token))
diff --git a/django/utils/crypto.py b/django/utils/crypto.py
index b364762275c..3804dd91111 100644
--- a/django/utils/crypto.py
+++ b/django/utils/crypto.py
@@ -164,8 +164,8 @@ else:
             dklen = hlen
         if dklen > (2 ** 32 - 1) * hlen:
             raise OverflowError('dklen too big')
-        l = -(-dklen // hlen)
-        r = dklen - (l - 1) * hlen
+        L = -(-dklen // hlen)
+        r = dklen - (L - 1) * hlen
 
         hex_format_string = "%%0%ix" % (hlen * 2)
 
@@ -187,5 +187,5 @@ else:
                 result ^= _bin_to_long(u)
             return _long_to_bin(result, hex_format_string)
 
-        T = [F(x) for x in range(1, l)]
-        return b''.join(T) + F(l)[:r]
+        T = [F(x) for x in range(1, L)]
+        return b''.join(T) + F(L)[:r]
diff --git a/django/utils/dateformat.py b/django/utils/dateformat.py
index 5e39648343b..70650bf625b 100644
--- a/django/utils/dateformat.py
+++ b/django/utils/dateformat.py
@@ -130,7 +130,7 @@ class TimeFormat(Formatter):
         "Minutes; i.e. '00' to '59'"
         return '%02d' % self.data.minute
 
-    def O(self):
+    def O(self):  # NOQA: E743
         """
         Difference to Greenwich time in hours; e.g. '+0200', '-0430'.
 
@@ -247,7 +247,7 @@ class DateFormat(TimeFormat):
         "Month, textual, long; e.g. 'January'"
         return MONTHS[self.data.month]
 
-    def I(self):
+    def I(self):  # NOQA: E743
         "'1' if Daylight Savings Time, '0' otherwise."
         try:
             if self.timezone and self.timezone.dst(self.data):
@@ -264,7 +264,7 @@ class DateFormat(TimeFormat):
         "Day of the month without leading zeros; i.e. '1' to '31'"
         return self.data.day
 
-    def l(self):
+    def l(self):  # NOQA: E743
         "Day of the week, textual, long; e.g. 'Friday'"
         return WEEKDAYS[self.data.weekday()]
 
diff --git a/docs/_ext/djangodocs.py b/docs/_ext/djangodocs.py
index 0f29341c341..8daca2bc6d7 100644
--- a/docs/_ext/djangodocs.py
+++ b/docs/_ext/djangodocs.py
@@ -309,10 +309,14 @@ class DjangoStandaloneHTMLBuilder(StandaloneHTMLBuilder):
         self.info(bold("writing templatebuiltins.js..."))
         xrefs = self.env.domaindata["std"]["objects"]
         templatebuiltins = {
-            "ttags": [n for ((t, n), (l, a)) in xrefs.items()
-                      if t == "templatetag" and l == "ref/templates/builtins"],
-            "tfilters": [n for ((t, n), (l, a)) in xrefs.items()
-                         if t == "templatefilter" and l == "ref/templates/builtins"],
+            "ttags": [
+                n for ((t, n), (k, a)) in xrefs.items()
+                if t == "templatetag" and k == "ref/templates/builtins"
+            ],
+            "tfilters": [
+                n for ((t, n), (k, a)) in xrefs.items()
+                if t == "templatefilter" and k == "ref/templates/builtins"
+            ],
         }
         outfilename = os.path.join(self.outdir, "templatebuiltins.js")
         with open(outfilename, 'w') as fp:
diff --git a/tests/generic_relations_regress/tests.py b/tests/generic_relations_regress/tests.py
index e3d13997060..d3986b6916d 100644
--- a/tests/generic_relations_regress/tests.py
+++ b/tests/generic_relations_regress/tests.py
@@ -194,15 +194,15 @@ class GenericRelationTests(TestCase):
         HasLinkThing.objects.create()
         b = Board.objects.create(name=str(hs1.pk))
         Link.objects.create(content_object=hs2)
-        l = Link.objects.create(content_object=hs1)
+        link = Link.objects.create(content_object=hs1)
         Link.objects.create(content_object=b)
         qs = HasLinkThing.objects.annotate(Sum('links')).filter(pk=hs1.pk)
         # If content_type restriction isn't in the query's join condition,
         # then wrong results are produced here as the link to b will also match
         # (b and hs1 have equal pks).
         self.assertEqual(qs.count(), 1)
-        self.assertEqual(qs[0].links__sum, l.id)
-        l.delete()
+        self.assertEqual(qs[0].links__sum, link.id)
+        link.delete()
         # Now if we don't have proper left join, we will not produce any
         # results at all here.
         # clear cached results
@@ -217,9 +217,9 @@ class GenericRelationTests(TestCase):
     def test_filter_targets_related_pk(self):
         HasLinkThing.objects.create()
         hs2 = HasLinkThing.objects.create()
-        l = Link.objects.create(content_object=hs2)
-        self.assertNotEqual(l.object_id, l.pk)
-        self.assertSequenceEqual(HasLinkThing.objects.filter(links=l.pk), [hs2])
+        link = Link.objects.create(content_object=hs2)
+        self.assertNotEqual(link.object_id, link.pk)
+        self.assertSequenceEqual(HasLinkThing.objects.filter(links=link.pk), [hs2])
 
     def test_editable_generic_rel(self):
         GenericRelationForm = modelform_factory(HasLinkThing, fields='__all__')
diff --git a/tests/gis_tests/test_geoforms.py b/tests/gis_tests/test_geoforms.py
index 8c6bc2a56a1..9149333814d 100644
--- a/tests/gis_tests/test_geoforms.py
+++ b/tests/gis_tests/test_geoforms.py
@@ -234,10 +234,10 @@ class SpecializedFieldTest(SimpleTestCase):
 
     def test_linestringfield(self):
         class LineStringForm(forms.Form):
-            l = forms.LineStringField()
+            f = forms.LineStringField()
 
         geom = self.geometries['linestring']
-        form = LineStringForm(data={'l': geom})
+        form = LineStringForm(data={'f': geom})
         self.assertTextarea(geom, form.as_p())
         self.assertMapWidget(form)
         self.assertFalse(LineStringForm().is_valid())
@@ -247,10 +247,10 @@ class SpecializedFieldTest(SimpleTestCase):
 
     def test_multilinestringfield(self):
         class LineStringForm(forms.Form):
-            l = forms.MultiLineStringField()
+            f = forms.MultiLineStringField()
 
         geom = self.geometries['multilinestring']
-        form = LineStringForm(data={'l': geom})
+        form = LineStringForm(data={'f': geom})
         self.assertTextarea(geom, form.as_p())
         self.assertMapWidget(form)
         self.assertFalse(LineStringForm().is_valid())
diff --git a/tests/httpwrappers/tests.py b/tests/httpwrappers/tests.py
index cde5ca65d2c..2cf0e23d63e 100644
--- a/tests/httpwrappers/tests.py
+++ b/tests/httpwrappers/tests.py
@@ -347,18 +347,18 @@ class HttpResponseTests(unittest.TestCase):
         r = HttpResponse()
         del r['Content-Type']
         r['foo'] = 'bar'
-        l = list(r.items())
-        self.assertEqual(len(l), 1)
-        self.assertEqual(l[0], ('foo', 'bar'))
-        self.assertIsInstance(l[0][0], str)
+        headers = list(r.items())
+        self.assertEqual(len(headers), 1)
+        self.assertEqual(headers[0], ('foo', 'bar'))
+        self.assertIsInstance(headers[0][0], str)
 
         r = HttpResponse()
         del r['Content-Type']
         r[b'foo'] = 'bar'
-        l = list(r.items())
-        self.assertEqual(len(l), 1)
-        self.assertEqual(l[0], ('foo', 'bar'))
-        self.assertIsInstance(l[0][0], str)
+        headers = list(r.items())
+        self.assertEqual(len(headers), 1)
+        self.assertEqual(headers[0], ('foo', 'bar'))
+        self.assertIsInstance(headers[0][0], str)
 
         r = HttpResponse()
         with self.assertRaises(UnicodeError):
diff --git a/tests/i18n/tests.py b/tests/i18n/tests.py
index 59235c9977c..38d99fa847e 100644
--- a/tests/i18n/tests.py
+++ b/tests/i18n/tests.py
@@ -544,14 +544,14 @@ class FormattingTests(SimpleTestCase):
         self.d = datetime.date(2009, 12, 31)
         self.dt = datetime.datetime(2009, 12, 31, 20, 50)
         self.t = datetime.time(10, 15, 48)
-        self.l = 10000 if PY3 else long(10000)  # NOQA: long undefined on PY3
+        self.long = 10000 if PY3 else long(10000)  # NOQA: long undefined on PY3
         self.ctxt = Context({
             'n': self.n,
             't': self.t,
             'd': self.d,
             'dt': self.dt,
             'f': self.f,
-            'l': self.l,
+            'l': self.long,
         })
 
     def test_locale_independent(self):
@@ -574,7 +574,7 @@ class FormattingTests(SimpleTestCase):
             )
             self.assertEqual('-66666.6', nformat(-66666.666, decimal_sep='.', decimal_pos=1))
             self.assertEqual('-66666.0', nformat(int('-66666'), decimal_sep='.', decimal_pos=1))
-            self.assertEqual('10000.0', nformat(self.l, decimal_sep='.', decimal_pos=1))
+            self.assertEqual('10000.0', nformat(self.long, decimal_sep='.', decimal_pos=1))
             self.assertEqual(
                 '10,00,00,000.00',
                 nformat(100000000.00, decimal_sep='.', decimal_pos=2, grouping=(3, 2, 0), thousand_sep=',')
@@ -588,8 +588,10 @@ class FormattingTests(SimpleTestCase):
                 nformat(1000000000.00, decimal_sep='.', decimal_pos=2, grouping=(3, 2, -1), thousand_sep=',')
             )
             # This unusual grouping/force_grouping combination may be triggered by the intcomma filter (#17414)
-            self.assertEqual('10000', nformat(self.l, decimal_sep='.', decimal_pos=0, grouping=0, force_grouping=True))
-
+            self.assertEqual(
+                '10000',
+                nformat(self.long, decimal_sep='.', decimal_pos=0, grouping=0, force_grouping=True)
+            )
             # date filter
             self.assertEqual('31.12.2009 в 20:50', Template('{{ dt|date:"d.m.Y в H:i" }}').render(self.ctxt))
             self.assertEqual('⌚ 10:15', Template('{{ t|time:"⌚ H:i" }}').render(self.ctxt))
@@ -612,7 +614,7 @@ class FormattingTests(SimpleTestCase):
             self.assertEqual('No localizable', localize('No localizable'))
             self.assertEqual('66666.666', localize(self.n))
             self.assertEqual('99999.999', localize(self.f))
-            self.assertEqual('10000', localize(self.l))
+            self.assertEqual('10000', localize(self.long))
             self.assertEqual('des. 31, 2009', localize(self.d))
             self.assertEqual('des. 31, 2009, 8:50 p.m.', localize(self.dt))
             self.assertEqual('66666.666', Template('{{ n }}').render(self.ctxt))
@@ -757,13 +759,13 @@ class FormattingTests(SimpleTestCase):
             with self.settings(USE_THOUSAND_SEPARATOR=True):
                 self.assertEqual('66.666,666', localize(self.n))
                 self.assertEqual('99.999,999', localize(self.f))
-                self.assertEqual('10.000', localize(self.l))
+                self.assertEqual('10.000', localize(self.long))
                 self.assertEqual('True', localize(True))
 
             with self.settings(USE_THOUSAND_SEPARATOR=False):
                 self.assertEqual('66666,666', localize(self.n))
                 self.assertEqual('99999,999', localize(self.f))
-                self.assertEqual('10000', localize(self.l))
+                self.assertEqual('10000', localize(self.long))
                 self.assertEqual('31 de desembre de 2009', localize(self.d))
                 self.assertEqual('31 de desembre de 2009 a les 20:50', localize(self.dt))
 
@@ -976,12 +978,12 @@ class FormattingTests(SimpleTestCase):
             with self.settings(USE_THOUSAND_SEPARATOR=True):
                 self.assertEqual('66,666.666', localize(self.n))
                 self.assertEqual('99,999.999', localize(self.f))
-                self.assertEqual('10,000', localize(self.l))
+                self.assertEqual('10,000', localize(self.long))
 
             with self.settings(USE_THOUSAND_SEPARATOR=False):
                 self.assertEqual('66666.666', localize(self.n))
                 self.assertEqual('99999.999', localize(self.f))
-                self.assertEqual('10000', localize(self.l))
+                self.assertEqual('10000', localize(self.long))
                 self.assertEqual('Dec. 31, 2009', localize(self.d))
                 self.assertEqual('Dec. 31, 2009, 8:50 p.m.', localize(self.dt))
 
diff --git a/tests/migrations/test_writer.py b/tests/migrations/test_writer.py
index 27cb21f4964..89352e0db07 100644
--- a/tests/migrations/test_writer.py
+++ b/tests/migrations/test_writer.py
@@ -181,15 +181,15 @@ class WriterTests(SimpleTestCase):
     """
 
     def safe_exec(self, string, value=None):
-        l = {}
+        d = {}
         try:
-            exec(force_str(string), globals(), l)
+            exec(force_str(string), globals(), d)
         except Exception as e:
             if value:
                 self.fail("Could not exec %r (from value %r): %s" % (string.strip(), value, e))
             else:
                 self.fail("Could not exec %r: %s" % (string.strip(), e))
-        return l
+        return d
 
     def serialize_round_trip(self, value):
         string, imports = MigrationWriter.serialize(value)
diff --git a/tests/prefetch_related/tests.py b/tests/prefetch_related/tests.py
index ee04049f16c..f88cb1c0e66 100644
--- a/tests/prefetch_related/tests.py
+++ b/tests/prefetch_related/tests.py
@@ -947,7 +947,7 @@ class MultiTableInheritanceTest(TestCase):
     @override_settings(DEBUG=True)
     def test_child_link_prefetch(self):
         with self.assertNumQueries(2):
-            l = [a.authorwithage for a in Author.objects.prefetch_related('authorwithage')]
+            authors = [a.authorwithage for a in Author.objects.prefetch_related('authorwithage')]
 
         # Regression for #18090: the prefetching query must include an IN clause.
         # Note that on Oracle the table name is upper case in the generated SQL,
@@ -955,7 +955,7 @@ class MultiTableInheritanceTest(TestCase):
         self.assertIn('authorwithage', connection.queries[-1]['sql'].lower())
         self.assertIn(' IN ', connection.queries[-1]['sql'])
 
-        self.assertEqual(l, [a.authorwithage for a in Author.objects.all()])
+        self.assertEqual(authors, [a.authorwithage for a in Author.objects.all()])
 
 
 class ForeignKeyToFieldTest(TestCase):
diff --git a/tests/queries/tests.py b/tests/queries/tests.py
index 44bc9c85912..8f0af65c8d5 100644
--- a/tests/queries/tests.py
+++ b/tests/queries/tests.py
@@ -564,14 +564,14 @@ class Queries1Tests(TestCase):
         self.assertEqual(d, {'a': 'one', 'b': 'two'})
 
         # Order by the number of tags attached to an item.
-        l = (
+        qs = (
             Item.objects
             .extra(select={
                 'count': 'select count(*) from queries_item_tags where queries_item_tags.item_id = queries_item.id'
             })
             .order_by('-count')
         )
-        self.assertEqual([o.count for o in l], [2, 2, 1, 0])
+        self.assertEqual([o.count for o in qs], [2, 2, 1, 0])
 
     def test_ticket6154(self):
         # Multiple filter statements are joined using "AND" all the time.
diff --git a/tests/template_tests/test_parser.py b/tests/template_tests/test_parser.py
index 7ae72c83f46..cf7cae04662 100644
--- a/tests/template_tests/test_parser.py
+++ b/tests/template_tests/test_parser.py
@@ -76,29 +76,29 @@ class ParserTests(TestCase):
             Variable({})
 
     def test_filter_args_count(self):
-        p = Parser("")
-        l = Library()
+        parser = Parser("")
+        register = Library()
 
-        @l.filter
+        @register.filter
         def no_arguments(value):
             pass
 
-        @l.filter
+        @register.filter
         def one_argument(value, arg):
             pass
 
-        @l.filter
+        @register.filter
         def one_opt_argument(value, arg=False):
             pass
 
-        @l.filter
+        @register.filter
         def two_arguments(value, arg, arg2):
             pass
 
-        @l.filter
+        @register.filter
         def two_one_opt_arg(value, arg, arg2=False):
             pass
-        p.add_library(l)
+        parser.add_library(register)
         for expr in (
                 '1|no_arguments:"1"',
                 '1|two_arguments',
@@ -106,7 +106,7 @@ class ParserTests(TestCase):
                 '1|two_one_opt_arg',
         ):
             with self.assertRaises(TemplateSyntaxError):
-                FilterExpression(expr, p)
+                FilterExpression(expr, parser)
         for expr in (
                 # Correct number of arguments
                 '1|no_arguments',
@@ -117,4 +117,4 @@ class ParserTests(TestCase):
                 # Not supplying all
                 '1|two_one_opt_arg:"1"',
         ):
-            FilterExpression(expr, p)
+            FilterExpression(expr, parser)
diff --git a/tests/test_client_regress/tests.py b/tests/test_client_regress/tests.py
index 7c4c8cde24c..48ce51b0915 100644
--- a/tests/test_client_regress/tests.py
+++ b/tests/test_client_regress/tests.py
@@ -956,10 +956,10 @@ class ContextTests(TestDataMixin, TestCase):
         c2.update({'goodbye': 'world', 'python': 'rocks'})
         c2.update({'goodbye': 'dolly'})
 
-        l = ContextList([c1, c2])
+        k = ContextList([c1, c2])
         # None, True and False are builtins of BaseContext, and present
         # in every Context without needing to be added.
-        self.assertEqual({'None', 'True', 'False', 'hello', 'goodbye', 'python', 'dolly'}, l.keys())
+        self.assertEqual({'None', 'True', 'False', 'hello', 'goodbye', 'python', 'dolly'}, k.keys())
 
     def test_15368(self):
         # Need to insert a context processor that assumes certain things about
diff --git a/tests/utils_tests/test_lazyobject.py b/tests/utils_tests/test_lazyobject.py
index 36135e6fc68..9dc225b55f8 100644
--- a/tests/utils_tests/test_lazyobject.py
+++ b/tests/utils_tests/test_lazyobject.py
@@ -199,10 +199,10 @@ class LazyObjectTestCase(TestCase):
 
     def test_copy_list(self):
         # Copying a list works and returns the correct objects.
-        l = [1, 2, 3]
+        lst = [1, 2, 3]
 
-        obj = self.lazy_wrap(l)
-        len(l)  # forces evaluation
+        obj = self.lazy_wrap(lst)
+        len(lst)  # forces evaluation
         obj2 = copy.copy(obj)
 
         self.assertIsNot(obj, obj2)
@@ -211,9 +211,9 @@ class LazyObjectTestCase(TestCase):
 
     def test_copy_list_no_evaluation(self):
         # Copying a list doesn't force evaluation.
-        l = [1, 2, 3]
+        lst = [1, 2, 3]
 
-        obj = self.lazy_wrap(l)
+        obj = self.lazy_wrap(lst)
         obj2 = copy.copy(obj)
 
         self.assertIsNot(obj, obj2)
@@ -245,10 +245,10 @@ class LazyObjectTestCase(TestCase):
 
     def test_deepcopy_list(self):
         # Deep copying a list works and returns the correct objects.
-        l = [1, 2, 3]
+        lst = [1, 2, 3]
 
-        obj = self.lazy_wrap(l)
-        len(l)  # forces evaluation
+        obj = self.lazy_wrap(lst)
+        len(lst)  # forces evaluation
         obj2 = copy.deepcopy(obj)
 
         self.assertIsNot(obj, obj2)
@@ -257,9 +257,9 @@ class LazyObjectTestCase(TestCase):
 
     def test_deepcopy_list_no_evaluation(self):
         # Deep copying doesn't force evaluation.
-        l = [1, 2, 3]
+        lst = [1, 2, 3]
 
-        obj = self.lazy_wrap(l)
+        obj = self.lazy_wrap(lst)
         obj2 = copy.deepcopy(obj)
 
         self.assertIsNot(obj, obj2)