Fix Python 3.12 deprecation warning

as "the global configuration variable Py_UnbufferedStdioFlag was
deprecated in Python 3.12 and using PyConfig.buffered_stdio is
recommended instead." — https://peps.python.org/pep-0741/

1 files changed, 18 insertions, 3 deletions

diff --git a/src/pyinterp.cc b/src/pyinterp.cc
index 71bbea22..2fecc8c4 100644
--- a/src/pyinterp.cc
+++ b/src/pyinterp.cc
@@ -149,15 +149,30 @@ void python_interpreter_t::initialize()
   try {
     DEBUG("python.interp", "Initializing Python");
 
+    // PyImport_AppendInittab docs: "This should be called before Py_Initialize()".
+    PyImport_AppendInittab((const char*)"ledger", PyInit_ledger);
+
     // Unbuffer stdio to avoid python output getting stuck in buffer when
     // stdout is not a TTY. Normally buffers are flushed by Py_Finalize but
     // Boost has a long-standing issue preventing proper shutdown of the
     // interpreter with Py_Finalize when embedded.
+#if PY_MINOR_VERSION < 12
     Py_UnbufferedStdioFlag = 1;
-    // PyImport_AppendInittab docs: "This should be called before Py_Initialize()".
-    PyImport_AppendInittab((const char*)"ledger", PyInit_ledger);
-
     Py_Initialize();
+#else
+    PyStatus status;
+    PyConfig config;
+    PyConfig_InitPythonConfig(&config);
+    config.buffered_stdio = 0;
+    status = Py_InitializeFromConfig(&config);
+    if (PyStatus_Exception(status)) {
+      PyConfig_Clear(&config);
+      Py_ExitStatusException(status);
+      return;
+    }
+    PyConfig_Clear(&config);
+#endif
+
     assert(Py_IsInitialized());
 
     hack_system_paths();