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-rw-r--r--Tools/idle/AutoIndent.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Tools/idle/AutoIndent.py b/Tools/idle/AutoIndent.py
index 1bdb05b..7784254 100644
--- a/Tools/idle/AutoIndent.py
+++ b/Tools/idle/AutoIndent.py
@@ -347,7 +347,7 @@ class AutoIndent:
def comment_region_event(self, event):
head, tail, chars, lines = self.get_region()
- for pos in range(len(lines)):
+ for pos in range(len(lines) - 1):
line = lines[pos]
lines[pos] = '##' + line
self.set_region(head, tail, chars, lines)