Claudiu Popa added the comment: Well, for instance, my use cases with InteractiveInterpreter are for debugging or creating custom interpreters for various apps and in those cases the patch helps, by giving better debugging clues through the exception cause. I agree that this was overlooked when exception chaining was added. Also, idlelib's PyShell is based on InteractiveInterpreter, but in addition, it implements the exception chaining.
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