commit 4575010943c7a6013fad39a9c31e07e3c498a3ce
author Raymond Hettinger <python@rcn.com> Sat Jun 21 11:27:36 2014 -0700
committer Raymond Hettinger <python@rcn.com> Sat Jun 21 11:27:36 2014 -0700
tree 15f224cdbcca568e0be6d6fed374e126638049e9
parent 94919a44a26b135108788f5a7bd5604189c3febe

Issue 21635:  Fix caching in difflib.SequenceMatcher.get_matching_blocks().

Lib/difflib.py

diff --git a/Lib/difflib.py b/Lib/difflib.py
index 5dac1d6..3880d84 100644
--- a/Lib/difflib.py
+++ b/Lib/difflib.py
@@ -523,8 +523,8 @@
             non_adjacent.append((i1, j1, k1))
 
         non_adjacent.append( (la, lb, 0) )
-        self.matching_blocks = non_adjacent
-        return map(Match._make, self.matching_blocks)
+        self.matching_blocks = map(Match._make, non_adjacent)
+        return self.matching_blocks
 
     def get_opcodes(self):
         """Return list of 5-tuples describing how to turn a into b.