only one instance of while len(...)

diff --git a/lib/sqlalchemy/topological.py b/lib/sqlalchemy/topological.py
index dcfe9ea7158713bd460c607e1b659357970ea8cd..87efc802bae379d1476b189b42ac78cd5436a20a 100644 (file)
--- a/lib/sqlalchemy/topological.py
+++ b/lib/sqlalchemy/topological.py
@@ -198,8 +198,8 @@ class QueueDependencySorter(object):
                 queue.append(n)
         cycles = {}
         output = []
-        while len(nodes) > 0:
-            if len(queue) == 0:
+        while nodes:
+            if not queue:
                 # edges remain but no edgeless nodes to remove; this indicates
                 # a cycle
                 if allow_all_cycles: