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

[Robert Collins]

Robert Collins added the comment:

The generator thing: the code was refactoring not so long ago to be generator based internally with lists as a UI shim. I don't think there is a major advantage either way. Less buffering on one hand. Less convenient in some cases on the other. Simple use like ''.join(foo.format()) is going to be unaffected.

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