4 files changed, 10 insertions, 21 deletions
diff --git a/lib/sqlalchemy/orm/collections.py b/lib/sqlalchemy/orm/collections.py
index 194cf0938..a8fd912cb 100644
--- a/lib/sqlalchemy/orm/collections.py
+++ b/lib/sqlalchemy/orm/collections.py
@@ -101,10 +101,6 @@ from sqlalchemy import exceptions, schema, util as sautil
 from sqlalchemy.orm import mapper
 
 try:
-    from threading import Lock
-except:
-    from dummy_threading import Lock
-try:
     from operator import attrgetter
 except:
     def attrgetter(attribute):
@@ -525,7 +521,7 @@ class CollectionAdapter(object):
         self._data = weakref.ref(d['data'])
 
 
-__instrumentation_mutex = Lock()
+__instrumentation_mutex = sautil.threading.Lock()
 def _prepare_instrumentation(factory):
     """Prepare a callable for future use as a collection class factory.
 
diff --git a/lib/sqlalchemy/pool.py b/lib/sqlalchemy/pool.py
index 526abe81c..5dbee8993 100644
--- a/lib/sqlalchemy/pool.py
+++ b/lib/sqlalchemy/pool.py
@@ -14,19 +14,11 @@ calling regular DBAPI connect() methods.
 """
 
 import weakref, time
-try:
-    import cPickle as pickle
-except:
-    import pickle
 
 from sqlalchemy import exceptions, logging
 from sqlalchemy import queue as Queue
+from sqlalchemy.util import thread, threading, pickle
 
-try:
-    import thread, threading
-except:
-    import dummy_thread as thread
-    import dummy_threading as threading
 
 proxies = {}
 
diff --git a/lib/sqlalchemy/types.py b/lib/sqlalchemy/types.py
index 56bd5a777..fe05910df 100644
--- a/lib/sqlalchemy/types.py
+++ b/lib/sqlalchemy/types.py
@@ -13,13 +13,9 @@ __all__ = [ 'TypeEngine', 'TypeDecorator', 'NullTypeEngine',
 
 import inspect
 import datetime as dt
-try:
-    import cPickle as pickle
-except:
-    import pickle
 
 from sqlalchemy import exceptions
-from sqlalchemy.util import Decimal
+from sqlalchemy.util import Decimal, pickle
 
 class AbstractType(object):
     def __init__(self, *args, **kwargs):
diff --git a/lib/sqlalchemy/util.py b/lib/sqlalchemy/util.py
index d2a202e50..1d23c387f 100644
--- a/lib/sqlalchemy/util.py
+++ b/lib/sqlalchemy/util.py
@@ -18,13 +18,18 @@ except ImportError:
 try:
     Set = set
     set_types = set, sets.Set
-except:
+except NameError:
     Set = sets.Set
     set_types = sets.Set,
 
 try:
+    import cPickle as pickle
+except ImportError:
+    import pickle
+
+try:
     reversed = __builtin__.reversed
-except:
+except AttributeError:
     def reversed(seq):
         i = len(seq) -1
         while  i >= 0: