[issue42179] Clarify chaining exceptions in tutorial/errors.rst

[Vladimir Ryabtsev]

Vladimir Ryabtsev <greatvovan at gmail.com> added the comment:

Also, the choice of the exception type in the example looks not very apt: you raise "IOError" but the traceback message says "OSError" (which is due to strange design decision "IOError = OSError"). For the tutorial, I would choose an exception that does not disguise as another exception.

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<https://bugs.python.org/issue42179>
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