Close file when reading number of interactions.

Author: drvinceknight

axelrod/interaction_utils.py

@@ -112,7 +112,8 @@ def read_interactions_from_file(filename, progress_bar=True,
     """
     if progress_bar:
         if not num_interactions:
-            num_interactions = sum(1 for line in open(filename))
+            with open(filename) as f:
+                num_interactions = sum(1 for line in f)
         progress_bar = tqdm.tqdm(total=num_interactions, desc="Loading")
 
     pairs_to_interactions = {}

axelrod/result_set.py

@@ -765,7 +765,8 @@ def create_progress_bar(self, desc=None):
                 A description.
         """
         if not self.num_interactions:
-            self.num_interactions = sum(1 for line in open(self.filename))
+            with open(self.filename) as f:
+                self.num_interactions = sum(1 for line in f)
         return tqdm.tqdm(total=self.num_interactions, desc=desc)
 
     def _read_players_and_repetition_numbers(self, progress_bar=False):