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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.
The documentation in this tree is in plain text files and can be viewed using any text file viewer. It uses ReST (reStructuredText) [1], and the Sphinx documentation system [2]. This allows it to be built into other forms for easier viewing and browsing. To create an HTML version of the docs: * Install Sphinx (using ``pip install Sphinx`` or some other method) * In this docs/ directory, type ``make html`` (or ``make.bat html`` on Windows) at a shell prompt. The documentation in _build/html/index.html can then be viewed in a web browser. [1] http://docutils.sourceforge.net/rst.html [2] http://sphinx-doc.org/