commit 53b2667dcf2a7d13af466a5fb91844f5125a920d
author Michael Seifert <michaelseifert04@yahoo.de> Wed Mar 15 08:42:02 2017 +0100
committer Serhiy Storchaka <storchaka@gmail.com> Wed Mar 15 09:42:02 2017 +0200
tree db0a2a111d9c9d361676abdfca7974291304d732
parent faa2cc63e45bc7d7ffab84bebe5a9f4fe065bd96

bpo-29800: Fix crashes in partial.__repr__ if the keys of partial.keywords are not strings (#649) (#671)

Modules/_functoolsmodule.c

diff --git a/Modules/_functoolsmodule.c b/Modules/_functoolsmodule.c
index 7abc9f4..1bcf16a 100644
--- a/Modules/_functoolsmodule.c
+++ b/Modules/_functoolsmodule.c
@@ -250,8 +250,11 @@
     /* Pack keyword arguments */
     assert (PyDict_Check(pto->kw));
     for (i = 0; PyDict_Next(pto->kw, &i, &key, &value);) {
-        Py_SETREF(arglist, PyUnicode_FromFormat("%U, %U=%R", arglist,
+        /* Prevent key.__str__ from deleting the value. */
+        Py_INCREF(value);
+        Py_SETREF(arglist, PyUnicode_FromFormat("%U, %S=%R", arglist,
                                                 key, value));
+        Py_DECREF(value);
         if (arglist == NULL)
             goto done;
     }