Ethan Furman <et...@stoneleaf.us> added the comment:

Yes.

Some of the changes are good, others should be `from None`.

The `from None` raises should include the ones where the new exception includes 
the text of the caught exception.

What is needed is text captured from the proposed changes to see if the 
previous exception was useful, and not easily gotten in other ways -- for 
example, the bz2 ImportError can be easily regenerated by `import bz2` at the 
REPL, so `from None` makes sense there.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39717>
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