Fix memcached tests for py3

elasticsearch/connection/memcached.py

@@ -5,7 +5,7 @@ try:
 except ImportError:
     from urllib.parse import urlencode
 
-from ..exceptions import TransportError, ConnectionError
+from ..exceptions import TransportError, ConnectionError, ImproperlyConfigured
 from .pooling import PoolingConnection
 
 class MemcachedConnection(PoolingConnection):

elasticsearch/connection/thrift.py

@@ -12,7 +12,7 @@ try:
 except ImportError:
     THRIFT_AVAILABLE = False
 
-from ..exceptions import ConnectionError
+from ..exceptions import ConnectionError, ImproperlyConfigured
 from .pooling import PoolingConnection
 
 class ThriftConnection(PoolingConnection):

elasticsearch/exceptions.py

@@ -1,4 +1,7 @@
-__all__ = ['ElastiSearchException', 'SerializationError', 'TransportError', 'NotFoundError']
+__all__ = ['ImproperlyConfigured', 'ElastiSearchException', 'SerializationError', 'TransportError', 'NotFoundError']
+
+class ImproperlyConfigured(Exception):
+    pass
 
 class ElastiSearchException(Exception):
     pass

test_elasticsearch/test_server/test_memcached.py

@@ -9,6 +9,10 @@ from unittest import SkipTest
 
 class TestMemcachedConnection(ElasticTestCase):
     def setUp(self):
+        try:
+            import pylibmc
+        except ImportError:
+            raise SkipTest("No pylibmc.")
         super(TestMemcachedConnection, self).setUp()
         nodes = self.client.cluster.node_info()
         for node_id, node_info in nodes["nodes"].items():