Add new fields to TracebackException, fix cause/context/lineno types #13231
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These are derived from the TracebackException docs: https://docs.python.org/3/library/traceback.html#traceback.TracebackException and the source code: https://github.com/python/cpython/blob/8b3cccf3f9508572d85b0044519f2bd5715dacad/Lib/traceback.py#L989
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Diff from mypy_primer, showing the effect of this PR on open source code: werkzeug (https://github.com/pallets/werkzeug)
+ src/werkzeug/debug/tbtools.py:261: error: Incompatible types in assignment (expression has type "Optional[TracebackException]", variable has type "TracebackException") [assignment]
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Dec 11, 2024
This preps for a typing fix in python/typeshed#13231 where `__cause__` and `__context__` can be None.
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These are derived from the TracebackException docs: https://docs.python.org/3/library/traceback.html#traceback.TracebackException
and the source code:
https://github.com/python/cpython/blob/8b3cccf3f9508572d85b0044519f2bd5715dacad/Lib/traceback.py#L989