From d2c5b4b549b24e637b16c60bdfae7292e1e75c06 Mon Sep 17 00:00:00 2001
From: Brett Cannon <bcannon@gmail.com>
Date: Sat, 10 Jul 2004 23:54:07 +0000
Subject: SequenceMatcher(None, [], []).get_grouped_opcodes() now returns a
 generator that behaves as if both lists has an empty string in each of them.

Closes bug #979794 (and duplicate bug #980117).
---
 Lib/difflib.py | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'Lib/difflib.py')

diff --git a/Lib/difflib.py b/Lib/difflib.py
index 529c78638c..e82c703a7d 100644
--- a/Lib/difflib.py
+++ b/Lib/difflib.py
@@ -572,6 +572,8 @@ class SequenceMatcher:
         """
 
         codes = self.get_opcodes()
+        if not codes:
+            codes = [("equal", 0, 1, 0, 1)]
         # Fixup leading and trailing groups if they show no changes.
         if codes[0][0] == 'equal':
             tag, i1, i2, j1, j2 = codes[0]
-- 
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