Add feature

Author: donBarbos

Doc/library/pickle.rst

@@ -532,7 +532,12 @@ The following option is accepted:
 
 .. option:: pickle_file
 
-   A pickle file.
+   A pickle file, which can be a regular filename or a filepath.
+   Additionally, you can use ``-`` to read from standard input (stdin).
+   For example, you can pipe a pickle file to the script using a command like:
+
+   .. code-block:: bash
+      echo ... | python -m pickle -
 
 
 .. _pickle-picklable:

Lib/pickle.py

@@ -1909,20 +1909,17 @@ def _loads(s, /, *, fix_imports=True, encoding="ASCII", errors="strict",
 
 if __name__ == "__main__":
     import argparse
+    import pprint
     parser = argparse.ArgumentParser(
         description='display contents of the pickle files')
     parser.add_argument(
         'pickle_file',
         nargs='+', help='the pickle file')
     args = parser.parse_args()
-    if not args.pickle_file:
-        parser.print_help()
-    else:
-        import pprint
-        for fn in args.pickle_file:
-            if fn == '-':
-                obj = load(sys.stdin.buffer)
-            else:
-                with open(fn, 'rb') as f:
-                    obj = load(f)
-            pprint.pprint(obj)
+    for fn in args.pickle_file:
+        if fn == '-':
+            obj = load(sys.stdin.buffer)
+        else:
+            with open(fn, 'rb') as f:
+                obj = load(f)
+        pprint.pprint(obj)