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-rw-r--r--Lib/difflib.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/difflib.py b/Lib/difflib.py
index 4af88a9..f161baa 100644
--- a/Lib/difflib.py
+++ b/Lib/difflib.py
@@ -1410,7 +1410,7 @@ def _mdiff(fromlines, tolines, context=None, linejunk=None,
change_re.sub(record_sub_info,markers)
# process each tuple inserting our special marks that won't be
# noticed by an xml/html escaper.
- for key,(begin,end) in sub_info[::-1]:
+ for key,(begin,end) in reversed(sub_info):
text = text[0:begin]+'\0'+key+text[begin:end]+'\1'+text[end:]
text = text[2:]
# Handle case of add/delete entire line