[svn r37264] create the new development trunk

--HG--
branch : trunk

py/builtin/reversed.py

@@ -0,0 +1,37 @@
+from __future__ import generators
+try:
+    reversed = reversed
+except NameError:
+
+    def reversed(sequence):
+        """reversed(sequence) -> reverse iterator over values of the sequence
+
+        Return a reverse iterator
+        """
+        if hasattr(sequence, '__reversed__'):
+            return sequence.__reversed__()
+        if not hasattr(sequence, '__getitem__'):
+            raise TypeError("argument to reversed() must be a sequence")
+        return reversed_iterator(sequence)
+
+
+    class reversed_iterator(object):
+
+        def __init__(self, seq):
+            self.seq = seq
+            self.remaining = len(seq)
+
+        def __iter__(self):
+            return self
+
+        def next(self):
+            i = self.remaining
+            if i > 0:
+                i -= 1
+                item = self.seq[i]
+                self.remaining = i
+                return item
+            raise StopIteration
+
+        def __length_hint__(self):
+            return self.remaining