Tweak 'poolclass' default arg processing [ticket:437]

diff --git a/lib/sqlalchemy/engine/strategies.py b/lib/sqlalchemy/engine/strategies.py
index 0c59ee8ebf48acce85acd3fd164397c835df73dc..910a1049de89230716d975dfa88d51f74a805bd5 100644 (file)
--- a/lib/sqlalchemy/engine/strategies.py
+++ b/lib/sqlalchemy/engine/strategies.py
@@ -74,7 +74,8 @@ class DefaultEngineStrategy(EngineStrategy):
                     raise exceptions.DBAPIError("Connection failed", e)
             creator = kwargs.pop('creator', connect)
 
-            poolclass = kwargs.pop('poolclass', getattr(dialect_cls, 'poolclass', poollib.QueuePool))
+            poolclass = (kwargs.pop('poolclass', None) or
+                         getattr(dialect_cls, 'poolclass', poollib.QueuePool))
             pool_args = {}
 
             # consume pool arguments from kwargs, translating a few of the arguments