commit 7ce57d67c925be894486ff6e3a6e330a1986cdcd
author Christian Heimes <christian@cheimes.de> Thu Jul 11 13:02:30 2013 +0200
committer Christian Heimes <christian@cheimes.de> Thu Jul 11 13:02:30 2013 +0200
tree 2dd39e53ea6f962eecd7caa0fac87c27075ff569
parent 848ee099f5b36650fa7c23ec91110f319e40fd13

Issue #18426: improve exception message. Courtesy of Amaury

Python/importdl.c

diff --git a/Python/importdl.c b/Python/importdl.c
index e393de1..0ea954c 100644
--- a/Python/importdl.c
+++ b/Python/importdl.c
@@ -97,8 +97,12 @@
 
     /* Remember pointer to module init function. */
     def = PyModule_GetDef(m);
-    if (def == NULL)
+    if (def == NULL) {
+        PyErr_Format(PyExc_SystemError,
+                     "initialization of %s did not return an extension "
+                     "module", shortname);
         goto error;
+    }
     def->m_base.m_init = p;
 
     /* Remember the filename as the __file__ attribute */