[docs] [issue23556] Scope for raise without argument is different in Python 2 and 3

[Martin Panter]

Martin Panter added the comment:

Here is a patch for Python 3. The re-raise behaviour reported by Antoine is already tested in test_raise.TestRaise.test_except_reraise().

My patch also clarifies some details about how __context__ is set:

* Context is the exception being handled, not necessarily the last exception
* “With” statements can influence context
* Re-raising does not set context; must be new exception object
* Add test case when context is not the last exception

I’m not so experienced with Python 2’s exception handling, so I haven’t got a patch for that. I suspect there is some shared “last exception” context. I wonder how it interacts with generators, multi-threading, __del__() and other callbacks, etc.

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keywords: +patch
stage:  -> patch review
versions: +Python 3.5, Python 3.6
Added file: http://bugs.python.org/file40053/raise-scope-py3.patch

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<http://bugs.python.org/issue23556>
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