Replace map() and filter() with comprehensions

This had the advantage of being more readable to people without a
functional programming background, and it avoids the need to use lambdas
which are both slow and have many corners in python. In a few cases it
also allows us to use a generator expression instead of a materialized
list, which save some memory.

1 files changed, 1 insertions, 1 deletions

diff --git a/alot/ui.py b/alot/ui.py
index 811f2150..a56efe4b 100644
--- a/alot/ui.py
+++ b/alot/ui.py
@@ -446,7 +446,7 @@ class UI(object):
         :type t: alot.buffers.Buffer
         :rtype: list
         """
-        return filter(lambda x: isinstance(x, t), self.buffers)
+        return [x for x in self.buffers if isinstance(x, t)]
 
     def clear_notify(self, messages):
         """