diff --git a/code-postprocessing/cocopp/testbedsettings.py b/code-postprocessing/cocopp/testbedsettings.py
index e97a66c79..a17173523 100644
--- a/code-postprocessing/cocopp/testbedsettings.py
+++ b/code-postprocessing/cocopp/testbedsettings.py
@@ -168,7 +168,8 @@ def get_first_reference_values():
 
 def get_short_names(file_name):
     try:
-        info_list = open(os.path.join(os.path.dirname(__file__), file_name), 'r').read().split('\n')
+        with open(os.path.join(os.path.dirname(__file__), file_name), 'r') as f:
+            info_list = f.read().split('\n')
         info_dict = {}
         for line in info_list:
             if len(line) == 0 or line.startswith('%') or line.isspace():
@@ -202,15 +203,16 @@ def info(self, fun_number=None):
         if fun_number is None:
             return self.__doc__
 
-        for line in open(os.path.join(os.path.abspath(os.path.split(__file__)[0]),
-                                      self.info_filename)).readlines():
-            if line.split():  # ie if not empty
-                try:  # empty lines are ignored
-                    fun = int(line.split()[0])
-                    if fun == fun_number:
-                        return 'F' + str(fun) + ' ' + ' '.join(line.split()[1:])
-                except ValueError:
-                    continue  # ignore annotations
+        with open(os.path.join(os.path.abspath(os.path.split(__file__)[0]),
+                               self.info_filename)) as f:
+            for line in f.readlines():
+                if line.split():  # ie if not empty
+                    try:  # empty lines are ignored
+                        fun = int(line.split()[0])
+                        if fun == fun_number:
+                            return 'F' + str(fun) + ' ' + ' '.join(line.split()[1:])
+                    except ValueError:
+                        continue  # ignore annotations
 
     def instantiate_attributes(self, class_, suffix_list=['target_values', 'targetsOfInterest']):
         """assign ``self.some_attr = class_(self.some_attr)`` if "some_attr" ends with any