Walter Dörwald added the comment: sys.displayhook doesn't fail, because it uses the backslashreplace error handler, and for sys.displayhook that's OK, because it's only used for screen output and there some output is better than no output. However print and pprint.pprint might be used for output that is consumed by other programs (via pipes etc.) and IMHO in this case "Errors should never pass silently."
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