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Avoid UnicodeEncodeError in tracing (issue pytest-dev#681)
RonnyPfannschmidt
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Sep 12, 2026
Tracing could turn a working hook call into a failing one in two ways: an object whose __repr__/__str__ raises propagated that exception out of the hook call (pytest-dev#424), and a lone surrogate in a hook argument or return value produced a message the writer could not encode (pytest-dev#681). Both are now handled in one place. _safe_repr()/_safe_str() wrap the conversion the way pytest's saferepr does -- KeyboardInterrupt and SystemExit still propagate, anything else is rendered as an unpresentable-object marker -- and escape lone surrogates with backslashreplace afterwards, which also covers surrogates that come out of an object's own __repr__. Traced values -- hook kwargs and the hook result -- now use repr() so their type is visible in the log; structural labels such as the hook name and the finish/--> markers keep using str() and stay unquoted. Supersedes pytest-dev#627, pytest-dev#666, pytest-dev#684 and pytest-dev#716. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Co-Authored-By: Claude Code <noreply@anthropic.com>
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Summary
Tracing crashed with
UnicodeEncodeErrorwhen hook args contained surrogate escapes.Change
Format trace values with
backslashreplaceso surrogates are escaped safely.Fixes #681