diff --git a/nodepool/driver/__init__.py b/nodepool/driver/__init__.py
index 5ae55c83e..179b34b58 100644
--- a/nodepool/driver/__init__.py
+++ b/nodepool/driver/__init__.py
@@ -655,7 +655,7 @@ class NodeRequestHandler(NodeRequestHandlerNotifications,
 
         # Launches are complete, so populate ready_nodes and failed_nodes.
         aborted_nodes = []
-        for node in self.nodeset[:]:
+        for node in self.nodeset.copy():
             if node.state == zk.READY:
                 self.ready_nodes.append(node)
             elif node.state == zk.ABORTED:
diff --git a/nodepool/tests/test_launcher.py b/nodepool/tests/test_launcher.py
index 87f2732d3..94a28e460 100644
--- a/nodepool/tests/test_launcher.py
+++ b/nodepool/tests/test_launcher.py
@@ -306,9 +306,7 @@ class TestLauncher(tests.DBTestCase):
 
         pool_worker = pool.getPoolWorkers('fake-provider')
         while not pool_worker[0].paused_handler:
-            # self.log.debug("tick")
             time.sleep(0.1)
-        self.log.debug("finished waiting")
 
         # The handler is paused now and the request should be in state PENDING
         req2 = self.waitForNodeRequest(req2, zk.PENDING)