From ad5cf975aed08cc4562dd008cf9f83b12b82ffb8 Mon Sep 17 00:00:00 2001
From: Paul Brossier <piem@piem.org>
Date: Fri, 10 Apr 2026 12:11:58 -0300
Subject: [PATCH] [py] only set RuntimeError string when needed in gen_code.py
 (closes gh-303)

---
 python/lib/gen_code.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/python/lib/gen_code.py b/python/lib/gen_code.py
index 95b9fa54..fbb06a03 100644
--- a/python/lib/gen_code.py
+++ b/python/lib/gen_code.py
@@ -345,7 +345,8 @@ Py_{shortname}_init (Py_{shortname} * self, PyObject * args, PyObject * kwds)
         out += """
   // return -1 and set error string on failure
   if (self->o == NULL) {{
-    PyErr_Format (PyExc_RuntimeError, "failed creating {shortname}");
+    if (PyErr_Occurred() == NULL)
+      PyErr_Format (PyExc_RuntimeError, "failed creating {shortname}");
     return -1;
   }}
 """.format(paramchars = paramchars, paramvals = paramvals, **self.__dict__)
-- 
2.11.0