Martin Panter added the comment:

For the Python 3 case, the documentation is vague and probably wrong, depending 
on what you understand “the current scope” to mean. I think it should read 
something like

. . . raise re-raises the current exception that is being handled. If no 
exception is being handled, a RuntimeError exception is raised indicating that 
this is an error.

I’m not sure but I suspect Python 2 is different because does not save the 
original exception when it handles a nested exception. In other words, at the 
point where the nested “bar” exception is raised inside the “foo” handler, 
Python forgets that “foo” was being handled.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23556>
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