Prevent ResourceWarning

patacrep/songs/__init__.py

@@ -194,9 +194,10 @@ class Song:
             # https://bugs.python.org/issue1692335
             return
         cached = {attr: getattr(self, attr) for attr in self.cached_attributes}
+        with open(self.cached_name, 'wb') as cache_file:
             pickle.dump(
                 cached,
-            open(self.cached_name, 'wb'),
+                cache_file,
                 protocol=-1
                 )