commit fabefc3c5b9e174e4eef2cb351a6ed8c81d721b0
author Raymond Hettinger <python@rcn.com> Sat Jun 21 11:57:36 2014 -0700
committer Raymond Hettinger <python@rcn.com> Sat Jun 21 11:57:36 2014 -0700
tree f7b6e74a14c8feef6c67dbc7ff6b51616eb0d712
parent 8aa9e4268fae4646b40d230962d74a6b61397217

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

Lib/difflib.py

diff --git a/Lib/difflib.py b/Lib/difflib.py
index 38dfef4..7eb42a9 100644
--- a/Lib/difflib.py
+++ b/Lib/difflib.py
@@ -511,8 +511,8 @@
             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 = list(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.