handle_system_exit() flushs files to warranty the output order
PyObject_Print() writes into the C object stderr, whereas PySys_WriteStderr()
writes into the Python object sys.stderr. Each object has its own buffer, so
call sys.stderr.flush() and fflush(stderr).
diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 4932c4a..d398196 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -1367,7 +1367,11 @@
if (PyLong_Check(value))
exitcode = (int)PyLong_AsLong(value);
else {
+ PyObject *sys_stderr = PySys_GetObject("stderr");
+ if (sys_stderr != NULL)
+ PyObject_CallMethod(sys_stderr, "flush", NULL);
PyObject_Print(value, stderr, Py_PRINT_RAW);
+ fflush(stderr);
PySys_WriteStderr("\n");
exitcode = 1;
}