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

[Vladimir Ryabtsev]

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

1. Such understanding of a tutorial is debatable. Tutorial is just a material for learning written with some system in mind, which is more interesting to read than dry reference material. A tutorial, generally dpeaking, may be both for beginners and for professionals.

2. The question about exception chaining is popular on Stackoverflow in people who came to Python with Java or C# background (see “python inner exception”).

3. Whatever material is given, it should not cause confusion, but now it does. Since this section has been added recently, it is better to fix it rather than remove entirely, aren’t you agree?

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