Use the preferred form of raise statements in the docs.
diff --git a/Doc/includes/email-unpack.py b/Doc/includes/email-unpack.py
index daf2470..8f99ded 100644
--- a/Doc/includes/email-unpack.py
+++ b/Doc/includes/email-unpack.py
@@ -37,7 +37,7 @@
         os.mkdir(opts.directory)
     except OSError, e:
         # Ignore directory exists error
-        if e.errno <> errno.EEXIST:
+        if e.errno != errno.EEXIST:
             raise
 
     fp = open(msgfile)