[1.10.x] Fixed flake8 2.6 warnings.

Backport of ea34426ae7 from master

django/contrib/gis/db/backends/base/models.py

@@ -40,14 +40,14 @@ class SpatialRefSysMixin(object):
                 try:
                     self._srs = gdal.SpatialReference(self.wkt)
                     return self.srs
-                except Exception as msg:
-                    pass
+                except Exception as e:
+                    msg = e
 
                 try:
                     self._srs = gdal.SpatialReference(self.proj4text)
                     return self.srs
-                except Exception as msg:
-                    pass
+                except Exception as e:
+                    msg = e
 
                 raise Exception('Could not get OSR SpatialReference from WKT: %s\nError:\n%s' % (self.wkt, msg))
         else:

django/core/management/commands/migrate.py

@@ -213,7 +213,7 @@ class Command(BaseCommand):
                 model_keys.append(model_key)
                 post_migrate_apps.unregister_model(*model_key)
         post_migrate_apps.render_multiple([
-            ModelState.from_model(apps.get_model(*model_key)) for model_key in model_keys
+            ModelState.from_model(apps.get_model(*model)) for model in model_keys
         ])
 
         # Send the post_migrate signal, so individual apps can do whatever they need

tests/postgres_tests/migrations/0002_create_test_models.py

@@ -3,7 +3,11 @@ from __future__ import unicode_literals
 
 from django.db import migrations, models
 
-from ..fields import *  # NOQA
+from ..fields import (
+    ArrayField, BigIntegerRangeField, DateRangeField, DateTimeRangeField,
+    FloatRangeField, HStoreField, IntegerRangeField, JSONField,
+    SearchVectorField,
+)
 from ..models import TagField
 
 

tests/servers/tests.py

@@ -104,12 +104,9 @@ class LiveServerViews(LiveServerBase):
         Ensure that the LiveServerTestCase serves 404s.
         Refs #2879.
         """
-        try:
+        with self.assertRaises(HTTPError) as err:
             self.urlopen('/')
-        except HTTPError as err:
-            self.assertEqual(err.code, 404, 'Expected 404 response')
-        else:
-            self.fail('Expected 404 response')
+        self.assertEqual(err.exception.code, 404, 'Expected 404 response')
 
     def test_view(self):
         """
@@ -133,12 +130,9 @@ class LiveServerViews(LiveServerBase):
         tries to access a static file that isn't explicitly put under
         STATIC_ROOT.
         """
-        try:
+        with self.assertRaises(HTTPError) as err:
             self.urlopen('/static/another_app/another_app_static_file.txt')
-        except HTTPError as err:
-            self.assertEqual(err.code, 404, 'Expected 404 response')
-        else:
-            self.fail('Expected 404 response (got %d)' % err.code)
+        self.assertEqual(err.exception.code, 404, 'Expected 404 response')
 
     def test_media_files(self):
         """