Removed obsolete string formatting operations

ogn/commands/logbook.py

@@ -21,7 +21,7 @@ def compute():
     print("Compute takeoffs and landings...")
     result = compute_takeoff_and_landing.delay()
     counter = result.get()
-    print("New/recalculated takeoffs/landings: {}"format(counter))
+    print("New/recalculated takeoffs/landings: {}".format(counter))
 
 
 @manager.command
@@ -140,7 +140,7 @@ def show(airport_name, latitude, longitude, altitude):
         .outerjoin(Device, union_query.c.address == Device.address) \
         .order_by(union_query.c.reftime)
 
-    print('--- Logbook (%s) ---' % airport_name)
+    print('--- Logbook ({}) ---'.format(airport_name))
 
     def none_datetime_replacer(datetime_object):
         return '--:--:--' if datetime_object is None else datetime_object.time()