Use Python 3 compatible 'queue' import

happybase/pool.py

@@ -4,10 +4,11 @@ HappyBase connection pool module.
 
 import contextlib
 import logging
-import Queue
 import socket
 import threading
 
+from six.moves import queue
+
 from thriftpy.thrift import TException
 
 from .connection import Connection
@@ -61,7 +62,7 @@ class ConnectionPool(object):
             "Initializing connection pool with %d connections", size)
 
         self._lock = threading.Lock()
-        self._queue = Queue.LifoQueue(maxsize=size)
+        self._queue = queue.LifoQueue(maxsize=size)
         self._thread_connections = threading.local()
 
         connection_kwargs = kwargs
@@ -81,7 +82,7 @@ class ConnectionPool(object):
         """Acquire a connection from the pool."""
         try:
             return self._queue.get(True, timeout)
-        except Queue.Empty:
+        except queue.Empty:
             raise NoConnectionsAvailable(
                 "No connection available from pool within specified "
                 "timeout")