Improve Error class #1882
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Improve Error class #1882
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1. Lazily compute the traceback string, using `traceback.format_exception()`. It’s only used in the rare case that `"traceback"` is in the `import_error_display` attribute. 2. Add a nice `__repr__`, to help debug test failures that make assertions on `Error` objects. I had a few cases where tests failed with inscrutable messages from pytest like `Left contains one more item: <import_export.results.Error object at 0x3173c8690>`, and I needed to rerun the test with the debugger to inspect the inner exception.
adamchainz
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Removed extraneous bracket
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traceback.format_exception(). It’s only used in the rare case that"traceback"is in theimport_error_displayattribute, so we can save that work and memory in the usual case.__repr__, to help debug test failures that make assertions onErrorobjects. I had a few cases where tests failed with inscrutable messages from pytest likeLeft contains one more item: <import_export.results.Error object at 0x3173c8690>, and I needed to rerun the test with the debugger to inspect the inner exception.