[issue20616] Add tracemalloc.Traceback.format() method

[STINNER Victor]

STINNER Victor added the comment:

> Victor: at this point I'm cherry-picking all revisions that will go into rc2 / final.

So would like to cherry-pick such addition?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20616>
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