9f4e031bd3
When Django reraises an exception, it sets the __cause__ attribute even in Python 2, mimicking Python's 3 behavior for "raise Foo from Bar". However, Python 3 also ensures that all exceptions have a __traceback__ attribute and thus the "traceback2" Python 2 module (backport of Python 3's "traceback" module) relies on the fact that whenever you have a __cause__ attribute, the recorded exception also has a __traceback__ attribute. This is breaking testtools which is using traceback2 (see https://github.com/testing-cabal/testtools/issues/162). This commit fixes this inconsistency by ensuring that Django sets the __traceback__ attribute on any exception stored in a __cause__ attribute of a reraised exception.
Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design. Thanks for checking it out.
All documentation is in the "docs" directory and online at https://docs.djangoproject.com/en/stable/. If you're just getting started, here's how we recommend you read the docs:
- First, read docs/intro/install.txt for instructions on installing Django.
- Next, work through the tutorials in order (docs/intro/tutorial01.txt, docs/intro/tutorial02.txt, etc.).
- If you want to set up an actual deployment server, read docs/howto/deployment/index.txt for instructions.
- You'll probably want to read through the topical guides (in docs/topics) next; from there you can jump to the HOWTOs (in docs/howto) for specific problems, and check out the reference (docs/ref) for gory details.
- See docs/README for instructions on building an HTML version of the docs.
Docs are updated rigorously. If you find any problems in the docs, or think they should be clarified in any way, please take 30 seconds to fill out a ticket here: https://code.djangoproject.com/newticket
To get more help:
- Join the #django channel on irc.freenode.net. Lots of helpful people hang out there. Read the archives at http://django-irc-logs.com/.
- Join the django-users mailing list, or read the archives, at https://groups.google.com/group/django-users.
To contribute to Django:
- Check out https://docs.djangoproject.com/en/dev/internals/contributing/ for information about getting involved.
To run Django's test suite:
- Follow the instructions in the "Unit tests" section of docs/internals/contributing/writing-code/unit-tests.txt, published online at https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/unit-tests/#running-the-unit-tests