--- textwrap_.py.orig	2016-11-21 12:03:10.270949101 +0900
+++ textwrap_.py	2016-11-21 12:03:12.495949101 +0900
@@ -92,7 +92,7 @@
 			# Convert current line back to a string and store it in list
 			# of all lines (return value).
 			if cur_line:
-				lines.append(indent + ''.join(cur_line))
+				lines.append(indent + ''.join(str(c).decode('utf-8') for c in cur_line))
 
 		return lines