Use dict's iter methods

This patch replaces a number of uses of dict.items, dict.values, and
dict.keys with their iterative siblings. The advantage of using the
iterator version is that they don't copy the keys, values, or items, but
simply return references. This reduces memory usage and may speed up the
these operations a bit.

1 files changed, 1 insertions, 1 deletions

diff --git a/alot/db/utils.py b/alot/db/utils.py
index 9ad1f98c..9c325247 100644
--- a/alot/db/utils.py
+++ b/alot/db/utils.py
@@ -249,7 +249,7 @@ def extract_headers(mail, headers=None):
     """
     headertext = u''
     if headers is None:
-        headers = mail.keys()
+        headers = mail.iterkeys()
     for key in headers:
         value = u''
         if key in mail: