Pass the file instead of looking up sys.stderr again.

Author: ZeroIntensity

Lib/traceback.py

@@ -137,8 +137,8 @@ def print_exception(exc, /, value=_sentinel, tb=_sentinel, limit=None, \
 BUILTIN_EXCEPTION_LIMIT = object()
 
 
-def _print_exception_bltin(exc, /):
-    file = sys.stderr if sys.stderr is not None else sys.__stderr__
+def _print_exception_bltin(exc, file=None, /):
+    file = file or sys.stderr if sys.stderr is not None else sys.__stderr__
     colorize = _colorize.can_colorize(file=file)
     return print_exception(exc, limit=BUILTIN_EXCEPTION_LIMIT, file=file, colorize=colorize)
 

Python/errors.c

@@ -1489,7 +1489,8 @@ write_unraisable_exc_file(PyThreadState *tstate, PyObject *exc_type,
     PyObject *print_exception_fn = PyImport_ImportModuleAttrString("traceback",
                                                                    "_print_exception_bltin");
     if (print_exception_fn != NULL && PyCallable_Check(print_exception_fn)) {
-        PyObject *result = PyObject_CallOneArg(print_exception_fn, exc_value);
+        PyObject *args[2] = {exc_value, file};
+        PyObject *result = PyObject_Vectorcall(print_exception_fn, args, 2, NULL);
         Py_DECREF(print_exception_fn);
         Py_XDECREF(result);
         if (result != NULL) {