Modernize ConftestImportFailure to use the exception chain - #14943
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Give ConftestImportFailure the same shape PluginImportFailure just got: a bare Exception subclass whose argument is the conftest path, with the original error carried by `raise ... from` on __cause__ instead of a hand-rolled `cause` attribute duplicating it. The custom __init__ and __str__ go away; str(e) is the path, which is exactly what the two message consumers want. The `cause` attribute dates to 8.0 (e1074f9), which replaced the old excinfo triplet without deprecation; the class is private to _pytest.config and a code search finds no external consumers, only vendored copies of pytest itself. No user-visible output changes. Co-Authored-By: Claude Fable 5 <ai@anthropic.com> Co-Authored-By: Claude Code <ai@anthropic.com>
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Stacked on #14824 — review only the last commit; the first is that PR.
Gives
ConftestImportFailurethe same shapePluginImportFailuregot in #14824: a bareExceptionsubclass whose argument is the conftest path, with the original error carried byraise ... fromon__cause__instead of a hand-rolledcauseattribute duplicating the chain. The custom__init__and__str__go away;str(e)is the path, which is exactly what both message consumers want.Why this is safe:
causeattribute is young — introduced in 8.0 (e1074f9) replacing the oldexcinfotriplet, without deprecation;_pytest.config(not exported aspytest.*), and a GitHub code search finds no external importers, only vendored copies of pytest itself;print_conftest_import_error, the--help/--versiongrace path,Node._repr_failure_pyunwrapping,--pdbpost-mortem unwrapping,_main) are updated in this PR.No user-visible output changes.
🤖 Written by Claude Code (Claude Fable 5); reviewed and submitted by @RonnyPfannschmidt.