Nick Coghlan added the comment:
On Mon, Feb 11, 2013 at 11:46 AM, Terry J. Reedy <rep...@bugs.python.org> wrote:
> I am also puzzled by the 'from None' part in
> + raise TypeError("'{!r}' is not a Python function".format(func)) from None
>
> While I remember that being in the pydev discussion and while "raise XyzError
> from None" executes, it does not seems to be documented for 3.3 in 7.8. The
> raise statement. (Should this be another issue?) In fact, that section says "
> if given, the second expression must be another exception class or instance",
> which excludes None.
That's a separate docs bug - it seems we missed the necessary language
reference updates when implementing PEP 309. The relevant docs are
here: http://docs.python.org/3/library/exceptions.html#built-in-exceptions
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<http://bugs.python.org/issue17159>
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