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-rw-r--r--Lib/pickletools.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/pickletools.py b/Lib/pickletools.py
index 1b6967ae46..ca09c03460 100644
--- a/Lib/pickletools.py
+++ b/Lib/pickletools.py
@@ -1858,7 +1858,7 @@ def optimize(p):
s.append(p[i:j])
i = stop
s.append(p[i:])
- return ''.join(s)
+ return b''.join(s)
##############################################################################
# A symbolic pickle disassembler.