[issue46729] Better str() for BaseExceptionGroup

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

Should it show the number of immediate subexceptions (i.e., len(eg.exceptions)) or the number of leaf exceptions? I'd be happy with the former (since that's what EdgeDb's MultiError does), which would not require adding an extra field to the base exception group struct.

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nosy: +gvanrossum, yselivanov

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<https://bugs.python.org/issue46729>
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