Replace list comprehension with set comprehension

Instead of using set([l for l in list]) use {l for l in list} (which
shouldn't be confused with a dict comprehension which requires the ':'
in the first value}. This avoids creating a list before reducing it to a
set. This feature is new in 2.7 and 3.3.

1 files changed, 1 insertions, 1 deletions

diff --git a/alot/db/thread.py b/alot/db/thread.py
index a1af1cd1..cfe9fa5d 100644
--- a/alot/db/thread.py
+++ b/alot/db/thread.py
@@ -59,7 +59,7 @@ class Thread(object):
         except ValueError:  # year is out of range
             self._newest_date = None
 
-        self._tags = set([t for t in thread.get_tags()])
+        self._tags = {t for t in thread.get_tags()}
         self._messages = {}  # this maps messages to its children
         self._toplevel_messages = []