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[Python-Dev] PEP 409 update [was: PEP 409 - final?]

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I got it, and I think it's fine to use explicit __cause__ reset,using Ellipsis, or even some __NoException__ special object if we decide to introduce one.I'm against allowing 'from ...' syntax.On 2012-02-03, at 12:29 PM, Ethan Furman wrote:> Yury Selivanov wrote:>> While the example is valid, I doubt that it is in any sense "common" case.>> No it is a corner case.  Another way to spell it is:>> try:>    try:>        raise IndexError()>    except:>        raise CustomError() from None> except CustomError as e:>    # nevermind, let's see the whole thing after all>    e.__cause__ = Ellipsis>    raise e>> Ethan

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