On Sun, Feb 28, 2021 at 6:17 PM Guido van Rossum <gu...@python.org> wrote:
> On Sun, Feb 28, 2021 at 2:40 AM Irit Katriel <iritkatr...@googlemail.com> > wrote: > >> >> In earlier versions of the PEP ExceptionGroup was not immutable and split >> actually removed matching exceptions from it. >> It was also iterable so you could get a flat list of all the contained >> leaf exceptions. Then we changed it. >> >> ExceptionGroup is a tree of exceptions, and the internal nodes of the >> tree (which are ExceptionGroups) have metadata on them - context, cause, >> traceback. >> If you want the full traceback of a leaf exception you need to >> concatenate the tracebacks of all the exceptions on the path from the root >> to the leaf. >> If you flatten an ExceptionGroup and create a new list >> ExceptionGroup(list(eg)) you don't lose metadata (unless eg's tree has >> depth 1). >> > > Is this a typo? Did you mean "If you flatten [it] and create a new list... > you *do* lose metadata (unless ... depth 1)"? > It is a typo, thanks.
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