address review: save history *after* statement was executed

Author: skirpichev

Lib/_pyrepl/simple_interact.py

@@ -142,13 +142,13 @@ def maybe_run_command(statement: str) -> bool:
             if maybe_run_command(statement):
                 continue
 
+            input_name = f"<python-input-{input_n}>"
+            more = console.push(_strip_final_indent(statement), filename=input_name, _symbol="single")  # type: ignore[call-arg]
+            assert not more
             try:
                 append_history_file()
             except (FileNotFoundError, PermissionError, OSError) as e:
                 warnings.warn(f"failed to open the history file for writing: {e}")
-            input_name = f"<python-input-{input_n}>"
-            more = console.push(_strip_final_indent(statement), filename=input_name, _symbol="single")  # type: ignore[call-arg]
-            assert not more
             input_n += 1
         except KeyboardInterrupt:
             r = _get_reader()

Lib/test/test_pyrepl/test_pyrepl.py

@@ -1360,7 +1360,7 @@ def test_history_survive_crash(self):
             history = pathlib.Path(hfile.name).read_text()
             self.assertIn("spam", history)
             self.assertIn("time", history)
-            self.assertIn("sleep", history)
+            self.assertNotIn("sleep", history)
             self.assertNotIn("preved", history)
 
     def test_keyboard_interrupt_after_isearch(self):

Misc/NEWS.d/next/Library/2025-04-08-14-50-39.gh-issue-127495.Q0V0bS.rst

@@ -1,3 +1,3 @@
-In PyREPL, append a new entry to the ``PYTHON_HISTORY`` file *before* every
-statement was executed.  This should preserve command-line history after
-interpreter is terminated.  Patch by Sergey B Kirpichev.
+In PyREPL, append a new entry to the ``PYTHON_HISTORY`` file *after* every
+statement.  This should preserve command-line history after interpreter is
+terminated.  Patch by Sergey B Kirpichev.