commit ab7bf2143e67ddc1510413fa0d7f9c621adf22fa
author Nick Coghlan <ncoghlan@gmail.com> Sun Feb 26 17:49:52 2012 +1000
committer Nick Coghlan <ncoghlan@gmail.com> Sun Feb 26 17:49:52 2012 +1000
tree 62a24ed4f57e4db638ebde745bb83e2e09fc86e3
parent cda6b6d60d96e6f755da92deb5e4066839095791

Close issue #6210: Implement PEP 409

Python/pythonrun.c

diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index a642c0b..f4e7e7b 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -1698,7 +1698,11 @@
         else if (PyExceptionInstance_Check(value)) {
             cause = PyException_GetCause(value);
             context = PyException_GetContext(value);
-            if (cause) {
+            if (cause && cause == Py_None) {
+                /* print neither cause nor context */
+                ;
+            }
+            else if (cause) {
                 res = PySet_Contains(seen, cause);
                 if (res == -1)
                     PyErr_Clear();