db/envelope: Don't call dunder method when not necessary

There are times to call dunder methods explicitly (double underscore
methods, like __contains__), but that's usually only required when
dealing with inheritance. In this case using the standard 'k in d'
syntax is clearer.

1 files changed, 1 insertions, 1 deletions

diff --git a/alot/db/envelope.py b/alot/db/envelope.py
index ef8171d6..bb0d9e2e 100644
--- a/alot/db/envelope.py
+++ b/alot/db/envelope.py
@@ -109,7 +109,7 @@ class Envelope(object):
             self.modified_since_sent = True
 
     def __contains__(self, name):
-        return self.headers.__contains__(name)
+        return name in self.headers
 
     def get(self, key, fallback=None):
         """secure getter for header values that allows specifying a `fallback`