Using errno.EEXIST rather than a literal 17 -- more compatibility.

Author: Max Noel

bin/dynamodb_dump

@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 
 import argparse
+import errno
 import os
 
 import boto
@@ -52,8 +53,8 @@ def dynamodb_dump(tables, out_dir):
     try:
         os.makedirs(out_dir)
     except OSError as e:
-        # Error 17 is "file exists", which we don't care about
-        if e.errno != 17:
+        # We don't care if the dir already exists.
+        if e.errno != errno.EEXIST:
             raise
 
     conn = boto.connect_dynamodb()