Use importutils.try_import() for MySQLdb

This is a common pattern we've adopted elsewhere, so use it here too.

Change-Id: I2e0947b4857005b478e796e9c9a7c05ea1f0d926

1 files changed, 4 insertions, 6 deletions

diff --git a/openstack/common/db/sqlalchemy/session.py b/openstack/common/db/sqlalchemy/session.py
index 2c714b1..c6aeae6 100644
--- a/openstack/common/db/sqlalchemy/session.py
+++ b/openstack/common/db/sqlalchemy/session.py
@@ -246,12 +246,6 @@ import time
 
 from eventlet import db_pool
 from eventlet import greenthread
-try:
-    import MySQLdb
-    from MySQLdb.constants import CLIENT as mysql_client_constants
-except ImportError:
-    MySQLdb = None
-    mysql_client_constants = None
 from sqlalchemy.exc import DisconnectionError, OperationalError, IntegrityError
 import sqlalchemy.interfaces
 import sqlalchemy.orm
@@ -259,10 +253,14 @@ from sqlalchemy.pool import NullPool, StaticPool
 from sqlalchemy.sql.expression import literal_column
 
 from openstack.common import cfg
+from openstack.common import importutils
 from openstack.common import log as logging
 from openstack.common.gettextutils import _
 from openstack.common import timeutils
 
+MySQLdb = importutils.try_import('MySQLdb')
+if MySQLdb is not None:
+    from MySQLdb.constants import CLIENT as mysql_client_constants
 
 sql_opts = [
     cfg.StrOpt('sql_connection',