diff --git a/keystone/common/sql/core.py b/keystone/common/sql/core.py
index 27df89145d..44d69217f3 100644
--- a/keystone/common/sql/core.py
+++ b/keystone/common/sql/core.py
@@ -119,9 +119,9 @@ class MySQLPingListener(object):
     def checkout(self, dbapi_con, con_record, con_proxy):
         try:
             dbapi_con.cursor().execute('select 1')
-        except dbapi_con.OperationalError, ex:
-            if ex.args[0] in (2006, 2013, 2014, 2045, 2055):
-                logging.warn('Got mysql server has gone away: %s', ex)
+        except dbapi_con.OperationalError as e:
+            if e.args[0] in (2006, 2013, 2014, 2045, 2055):
+                logging.warn('Got mysql server has gone away: %s', e)
                 raise DisconnectionError("Database server went away")
             else:
                 raise
diff --git a/keystone/middleware/auth_token.py b/keystone/middleware/auth_token.py
index e8ed99b345..cd9b806605 100644
--- a/keystone/middleware/auth_token.py
+++ b/keystone/middleware/auth_token.py
@@ -286,7 +286,7 @@ class AuthProtocol(object):
                 LOG.info('Invalid user token - rejecting request')
                 return self._reject_request(env, start_response)
 
-        except ServiceError, e:
+        except ServiceError as e:
             LOG.critical('Unable to obtain admin token: %s' % e)
             resp = webob.exc.HTTPServiceUnavailable()
             return resp(env, start_response)
@@ -378,7 +378,7 @@ class AuthProtocol(object):
             conn.request(method, path)
             response = conn.getresponse()
             body = response.read()
-        except Exception, e:
+        except Exception as e:
             LOG.error('HTTP connection exception: %s' % e)
             raise ServiceError('Unable to communicate with keystone')
         finally:
@@ -418,7 +418,7 @@ class AuthProtocol(object):
             conn.request(method, full_path, **kwargs)
             response = conn.getresponse()
             body = response.read()
-        except Exception, e:
+        except Exception as e:
             LOG.error('HTTP connection exception: %s' % e)
             raise ServiceError('Unable to communicate with keystone')
         finally:
diff --git a/keystone/middleware/core.py b/keystone/middleware/core.py
index 6f8abff2a4..a49f743be4 100644
--- a/keystone/middleware/core.py
+++ b/keystone/middleware/core.py
@@ -147,7 +147,7 @@ class XmlBodyMiddleware(wsgi.Middleware):
             try:
                 body_obj = jsonutils.loads(response.body)
                 response.body = serializer.to_xml(body_obj)
-            except:
+            except Exception:
                 raise exception.Error(message=response.body)
         return response
 
diff --git a/keystone/middleware/s3_token.py b/keystone/middleware/s3_token.py
index 7cf2e3944d..0f207b3d8b 100644
--- a/keystone/middleware/s3_token.py
+++ b/keystone/middleware/s3_token.py
@@ -99,7 +99,7 @@ class S3Token(object):
                          headers=headers)
             response = conn.getresponse()
             output = response.read()
-        except Exception, e:
+        except Exception as e:
             self.logger.info('HTTP connection exception: %s' % e)
             resp = self.deny_request('InvalidURI')
             raise ServiceError(resp)
@@ -143,7 +143,7 @@ class S3Token(object):
         auth_header = req.headers['Authorization']
         try:
             access, signature = auth_header.split(' ')[-1].rsplit(':', 1)
-        except(ValueError):
+        except ValueError:
             msg = 'You have an invalid Authorization header: %s'
             self.logger.debug(msg % (auth_header))
             return self.deny_request('InvalidURI')(environ, start_response)
diff --git a/tests/test_content_types.py b/tests/test_content_types.py
index 95d1256abb..67565207b8 100644
--- a/tests/test_content_types.py
+++ b/tests/test_content_types.py
@@ -258,10 +258,6 @@ class RestfulTestCase(test.TestCase):
 class CoreApiTests(object):
     def assertValidError(self, error):
         """Applicable to XML and JSON."""
-        try:
-            print error.attrib
-        except:
-            pass
         self.assertIsNotNone(error.get('code'))
         self.assertIsNotNone(error.get('title'))
         self.assertIsNotNone(error.get('message'))
diff --git a/tests/test_serializer.py b/tests/test_serializer.py
index 0a4ff66b72..288e551694 100644
--- a/tests/test_serializer.py
+++ b/tests/test_serializer.py
@@ -29,7 +29,7 @@ class XmlSerializerTestCase(test.TestCase):
         """
         try:
             self.assertEqual(a, b)
-        except:
+        except AssertionError:
             a = re.sub('[ \n]+', ' ', a).strip().split()
             b = re.sub('[ \n]+', ' ', b).strip().split()
             self.assertEqual(a, b)