Don't use 'raise exc from None' because it suppresses exception causes - #1158
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lovelydinosaur
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lovelydinosaur
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All of these cases look more correct to me without the "from None" yup.
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Fixes #1114
I think
raise exc from Noneis better for targeted cases (like catching KeyError to re-raise a more suitable exception). For catch-all clauses likeexcept Exceptionwe are potentially throwing out useful info about the cause.