bpo-41395: use context manager to close filetype objects

Lib/pickle.py

@@ -1812,6 +1812,7 @@ def _test():
             parser.print_help()
         else:
             import pprint
-            for f in args.pickle_file:
-                obj = load(f)
-                pprint.pprint(obj)
+            for pickle_file in args.pickle_file:
+                with pickle_file as f:
+                    obj = load(f)
+                    pprint.pprint(obj)

Lib/pickletools.py

@@ -2880,11 +2880,14 @@ def _test():
         if not args.pickle_file:
             parser.print_help()
         elif len(args.pickle_file) == 1:
-            dis(args.pickle_file[0], args.output, None,
-                args.indentlevel, annotate)
+            with args.pickle_file[0] as pickle_file, args.output as output:
+                dis(pickle_file, output, None,
+                    args.indentlevel, annotate)
         else:
             memo = {} if args.memo else None
-            for f in args.pickle_file:
-                preamble = args.preamble.format(name=f.name)
-                args.output.write(preamble + '\n')
-                dis(f, args.output, memo, args.indentlevel, annotate)
+            with args.output as output:
+                for pickle_file in args.pickle_file:
+                    with pickle_file as f:
+                        preamble = args.preamble.format(name=f.name)
+                        output.write(preamble + '\n')
+                        dis(f, args.output, memo, args.indentlevel, annotate)

Misc/ACKS

@@ -1148,6 +1148,7 @@ Tim Mitchell
 Zubin Mithra
 Florian Mladitsch
 Doug Moen
+Amir Mohammadi
 Jakub Molinski
 Juliette Monsel
 Paul Monson

Misc/NEWS.d/next/Library/2020-08-02-11-40-31.bpo-41395.NR20Rh.rst

@@ -0,0 +1,2 @@
+Use context manager to close filetype objects automatically and avoid
+ResourceWarning.