python-useful-helpers / exec-helpers / 41902541872

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Hide exec-helpers frames in pytest failure reports (#176)

A timeout or an unexpected exit code already names the command and carries its output,
so the package frames in a pytest report only push the caller's line out of view.

- Add _helpers.hide_traceback, which pytest calls through a module-level __tracebackhide__.
- It hides the frame for an ExecHelperError and keeps it for any other exception.
- Set __tracebackhide__ in every module on the execute and check_call path.
- test_timeout checks that no package frame is left; a new test checks that other errors keep them.

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