This adds a leak, but fixes a crash. The leaking code is:

neal.norwitz · neal.norwitz · commit 143f7eee0ef5 · 2007-08-27T03:22:50.000Z
"{0:.{precision}s}".format('hello world', precision=5) I pretty sure it's because of the 'precision' keyword. Still need to investigate further. git-svn-id: http://svn.python.org/projects/python/branches/py3k@57548 6015fed2-1504-0410-9fe1-9d1591cc4771
diff --git a/Objects/stringlib/string_format.h b/Objects/stringlib/string_format.h
@@ -416,6 +416,7 @@ get_field_object(SubString *input, PyObject *args, PyObject *kwargs)
             Py_DECREF(key);
             goto error;
         }
+        Py_INCREF(obj);
     } else {
         /* look up in args */
         obj = PySequence_GetItem(args, index);

Original file line number	Diff line number	Diff line change
`@@ -416,6 +416,7 @@ get_field_object(SubString input, PyObject args, PyObject *kwargs)`
`416`	`416`	`Py_DECREF(key);`
`417`	`417`	`goto error;`
`418`	`418`	`}`
	`419`	`+ Py_INCREF(obj);`
`419`	`420`	`} else {`
`420`	`421`	`/* look up in args */`
`421`	`422`	`obj = PySequence_GetItem(args, index);`