[issue17911] traceback: add a new thin class storing a traceback without storing local variables

[Antoine Pitrou]

Antoine Pitrou added the comment:

> In this view, __traceback__ is primarily about accessing *chained*
> tracebacks

Please let's not make up sophistic arguments when the only motivation for triples is backwards compatibility of *existing* APIs.

Exception triples are an unnecessary bother in Python 3. This new API should accept exception instances primarily. Accepting triples as well is ok but it shouldn't be made the only possibility.

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<http://bugs.python.org/issue17911>
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