close file with context manager

theano/gof/utils.py

@@ -568,4 +568,6 @@ def hash_from_file(file_path):
     Return the MD5 hash of a file.
 
     """
-    return hash_from_code(open(file_path, 'rb').read())
+    with open(file_path, 'rb') as f:
+        file_content = f.read()
+    return hash_from_code(file_content)