Improve argument handling in pdb.py

Author: Shrey-N

Lib/pdb.py

@@ -3635,9 +3635,14 @@ def parse_args():
         opts.module = opt_module.module
         args = args[2:]
     elif args[0].startswith('-'):
-        # Invalid argument before the script name.
-        invalid_args = list(itertools.takewhile(lambda a: a.startswith('-'), args))
-        parser.error(f"unrecognized arguments: {' '.join(invalid_args)}")
+        if args[0] == '--':
+            args.pop(0)
+            if not args:
+                parser.error("missing script or module to run")
+        else:
+            # Invalid argument before the script name.
+            invalid_args = list(itertools.takewhile(lambda a: a.startswith('-'), args))
+            parser.error(f"unrecognized arguments: {' '.join(invalid_args)}")
 
     # Otherwise it's debugging a script and we already parsed all -c commands.