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

[Robert Collins]

Robert Collins added the comment:

This iteration provides two constructors for TracebackException, one for exception objects, one for exc_info tuples. So it should be easy to use.

The __init__ takes the exc_info tuple because thats less code (much easier to destructure rather than restructure), but in the docs and docstrings I point to the classmethods, which includes from_exception - that takes a single exception object.

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Added file: http://bugs.python.org/file38007/issue17911-4.patch

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