--- a/___%2Aitem__	Sun Jun 30 10:01:43 2013 +0200
+++ b/___%2Aitem__	Sun Jun 30 10:05:40 2013 +0200
@@ -9,8 +9,16 @@
 thing.__delitem__(key)
 
 thing[start:end:step]
-def get_slice(thing, start, end, step):
-    if hasattr(thing, '__getslice__'):
-        return thing.__getslice__(start, end, step)
+def get_slice(thing, start=None, end=None, step=None):
+    if step is None and hasattr(thing, '__getslice__'):
+        if start is None:
+            start = 0
+        elif start < 0:
+            start += len(thing)
+        if end is None:
+            end = sys.maxint
+        elif end < 0:
+            end += len(thing)
+        return thing.__getslice__(start, end)
     return thing[slice(start, end, step)]
 }}}
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