gh-125600: Only show stale code warning on source code display commands

Lib/pdb.py

@@ -493,6 +493,16 @@ def _cmdloop(self):
             except KeyboardInterrupt:
                 self.message('--KeyboardInterrupt--')
 
+    def _update_file_mtime(self):
+        """update the file mtime table with the current frame's file if it
+        hasn't been seen yet."""
+        filename = self.curframe.f_code.co_filename
+        if filename not in self._file_mtime_table:
+            try:
+                self._file_mtime_table[filename] = os.path.getmtime(filename)
+            except Exception:
+                pass
+
     def _validate_file_mtime(self):
         """Check if the source file of the current frame has been modified since
         the last time we saw it. If so, give a warning."""
@@ -505,7 +515,7 @@ def _validate_file_mtime(self):
             mtime != self._file_mtime_table[filename]):
             self.message(f"*** WARNING: file '{filename}' was edited, "
                          "running stale code until the program is rerun")
-        self._file_mtime_table[filename] = mtime
+            self._file_mtime_table[filename] = mtime
 
     # Called before loop, handles display expressions
     # Set up convenience variable containers
@@ -835,7 +845,7 @@ def onecmd(self, line):
         a breakpoint command list definition.
         """
         if not self.commands_defining:
-            self._validate_file_mtime()
+            self._update_file_mtime()
             if line.startswith('_pdbcmd'):
                 command, arg, line = self.parseline(line)
                 if hasattr(self, command):
@@ -979,6 +989,7 @@ def completedefault(self, text, line, begidx, endidx):
 
     def _pdbcmd_print_frame_status(self, arg):
         self.print_stack_trace(0)
+        self._validate_file_mtime()
         self._show_display()
 
     def _pdbcmd_silence_frame_status(self, arg):
@@ -1860,6 +1871,7 @@ def do_list(self, arg):
                 self.message('[EOF]')
         except KeyboardInterrupt:
             pass
+        self._validate_file_mtime()
     do_l = do_list
 
     def do_longlist(self, arg):
@@ -1878,6 +1890,7 @@ def do_longlist(self, arg):
             self.error(err)
             return
         self._print_lines(lines, lineno, breaklist, self.curframe)
+        self._validate_file_mtime()
     do_ll = do_longlist
 
     def do_source(self, arg):

Lib/test/test_pdb.py

@@ -3662,6 +3662,25 @@ def test_file_modified_after_execution(self):
         self.assertIn("WARNING:", stdout)
         self.assertIn("was edited", stdout)
 
+    def test_file_modified_and_immediately_restarted(self):
+        script = """
+            print("hello")
+        """
+
+        # the time.sleep is needed for low-resolution filesystems like HFS+
+        commands = """
+            filename = $_frame.f_code.co_filename
+            f = open(filename, "w")
+            f.write("print('goodbye')")
+            import time; time.sleep(1)
+            f.close()
+            restart
+        """
+
+        stdout, stderr = self.run_pdb_script(script, commands)
+        self.assertNotIn("WARNING:", stdout)
+        self.assertNotIn("was edited", stdout)
+
     def test_file_modified_after_execution_with_multiple_instances(self):
         # the time.sleep is needed for low-resolution filesystems like HFS+
         script = """

Misc/NEWS.d/next/Library/2024-10-16-15-55-50.gh-issue-125600.yMsJx0.rst

@@ -0,0 +1 @@
+Only show stale code warning in :mod:`pdb` when we display source code.