gh-125115: Pass unknown pdb command line args to script instead of fail

Lib/pdb.py

@@ -2435,30 +2435,38 @@ def main():
     parser.add_argument('-c', '--command', action='append', default=[], metavar='command', dest='commands',
                         help='pdb commands to execute as if given in a .pdbrc file')
     parser.add_argument('-m', metavar='module', dest='module')
-    parser.add_argument('args', nargs='*',
-                        help="when -m is not specified, the first arg is the script to debug")
 
     if len(sys.argv) == 1:
         # If no arguments were given (python -m pdb), print the whole help message.
         # Without this check, argparse would only complain about missing required arguments.
         parser.print_help()
         sys.exit(2)
 
-    opts = parser.parse_args()
+    opts, args = parser.parse_known_args()
+
+    invalid_args = []
+    for arg in args:
+        if not arg.startswith('-'):
+            break
+        invalid_args.append(arg)
+
+    if invalid_args:
+        parser.error(f"unrecognized arguments: {' '.join(invalid_args)}")
+        sys.exit(2)
 
     if opts.module:
         file = opts.module
         target = _ModuleTarget(file)
     else:
-        if not opts.args:
+        if not args:
             parser.error("no module or script to run")
-        file = opts.args.pop(0)
+        file = args.pop(0)
         if file.endswith('.pyz'):
             target = _ZipTarget(file)
         else:
             target = _ScriptTarget(file)
 
-    sys.argv[:] = [file] + opts.args  # Hide "pdb.py" and pdb options from argument list
+    sys.argv[:] = [file] + args  # Hide "pdb.py" and pdb options from argument list
 
     # Note on saving/restoring sys.argv: it's a good idea when sys.argv was
     # modified by the script being debugged. It's a bad idea when it was

Lib/test/test_pdb.py

@@ -3052,6 +3052,7 @@ def _run_pdb(self, pdb_args, commands,
     def run_pdb_script(self, script, commands,
                        expected_returncode=0,
                        extra_env=None,
+                       script_args=None,
                        pdbrc=None,
                        remove_home=False):
         """Run 'script' lines with pdb and the pdb 'commands'."""
@@ -3069,7 +3070,9 @@ def run_pdb_script(self, script, commands,
         if remove_home:
             homesave = os.environ.pop('HOME', None)
         try:
-            stdout, stderr = self._run_pdb([filename], commands, expected_returncode, extra_env)
+            if script_args is None:
+                script_args = []
+            stdout, stderr = self._run_pdb([filename] + script_args, commands, expected_returncode, extra_env)
         finally:
             if homesave is not None:
                 os.environ['HOME'] = homesave
@@ -3508,6 +3511,19 @@ def test_run_module_with_args(self):
         stdout, _ = self._run_pdb(["-m", "calendar", "1"], commands)
         self.assertIn("December", stdout)
 
+    def test_run_script_with_args(self):
+        script = """
+            import sys
+            print(sys.argv[1:])
+        """
+        commands = """
+            continue
+            quit
+        """
+
+        stdout, stderr = self.run_pdb_script(script, commands, script_args=["--bar", "foo"])
+        self.assertIn("['--bar', 'foo']", stdout)
+
     def test_breakpoint(self):
         script = """
             if __name__ == '__main__':

Misc/NEWS.d/next/Library/2024-10-14-02-07-44.gh-issue-125115.IOf3ON.rst

@@ -0,0 +1 @@
+Fixed a bug in :mod:`pdb` where arguments starting with ``-`` can't be passed to the debugged script.