commit 08ef9d98b2530d0a8e835ef4fb0a2a5f8bf64ced
author Guido van Rossum <guido@python.org> Sat Nov 09 22:32:05 1996 +0000
committer Guido van Rossum <guido@python.org> Sat Nov 09 22:32:05 1996 +0000
tree dc9b3baa4e73a2b0c98dd50be06731ad07cae7cb
parent 115c1144ea5298b0c2e839412b5b98b11d840be9

Only call sq_length in Sequence_GetItem for negative index.

Objects/abstract.c

diff --git a/Objects/abstract.c b/Objects/abstract.c
index bb197a5..8d07cfa 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -666,12 +666,14 @@
 
   if(! s) return Py_ReturnNullError();
 
-  if(! ((m=s->ob_type->tp_as_sequence) && m->sq_length && m->sq_item))
+  if(! ((m=s->ob_type->tp_as_sequence) && m->sq_item))
     return Py_ReturnMethodError("__getitem__");  
 
-  if(0 > (l=m->sq_length(s))) return NULL;
-
-  if(i < 0) i += l;
+  if(i < 0)
+    {
+      if(0 > (l=m->sq_length(s))) return NULL;
+      i += l;
+    }
       
   return m->sq_item(s,i);
 }