From efded6423f5008f564a19ee5aad2d029fbe726b1 Mon Sep 17 00:00:00 2001
From: Zineb Aly <zaly@km3net.de>
Date: Mon, 23 Mar 2020 22:07:30 +0100
Subject: [PATCH] Apply suggestion to km3io/offline.py

---
 km3io/offline.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/km3io/offline.py b/km3io/offline.py
index cb68d2d..faad4f5 100644
--- a/km3io/offline.py
+++ b/km3io/offline.py
@@ -189,7 +189,7 @@ class Header:
     """The header"""
     def __init__(self, header):
         self._data = {}
-        self._missing_keys = list(set(header.keys()) - set(mc_header.keys()))
+        self._missing_keys = set(header.keys()) - set(mc_header.keys())
 
         for attribute, fields in mc_header.items():
             values = header.get(attribute, '').split()
-- 
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