Example: http://bugs.python.org/issue8423

Index: Lib/test/regrtest.py
===================================================================
--- Lib/test/regrtest.py	(révision 80431)
+++ Lib/test/regrtest.py	(copie de travail)
@@ -507,6 +507,13 @@
     else:
         tests = iter(selected)

+    # set stdout encoder error handler to backslashreplace as done for stderr
+    # to avoid UnicodeEncodeError while printing a traceback
+    stdout = sys.stdout
+    sys.stdout = open(stdout.fileno(), 'w',
+        encoding=stdout.encoding,
+        errors="backslashreplace")
+
     if use_mp:
         from threading import Thread
         from queue import Queue