print default region

Author: nchammas

ec2/spark_ec2.py

@@ -161,7 +161,7 @@ def parse_args():
         help="Master instance type (leave empty for same as instance-type)")
     parser.add_option(
         "-r", "--region", default="us-east-1",
-        help="EC2 region used to launch instances in, or to find them in")
+        help="EC2 region used to launch instances in, or to find them in (default: %default)")
     parser.add_option(
         "-z", "--zone", default="",
         help="Availability zone to launch instances in, or 'all' to spread " +