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Wed Jul 27 15:31:54 CEST 2011 · https://mail.python.org/pipermail/python-dev/2011-July/112556.html

> > I would use %r instead of %s for both fields here.  Non-ASCII characters
> > and unseen whitespace are at least two reasons to overuse %r in
> > debug/error messages instead of %s.
>
> Actually, you want %a for non-ASCII messages to be escaped.
> (however, there's hardly any reason to worry about it when it comes to
> stdlib module names)
>

I wasn't aware of '%a' at all? It doesn't appear to be documented, and
Python 2.6 doesn't support it:

    ValueError: unsupported format character 'a' (0x61) at index 1

If it's new, it should at least be documented in library/stdtypes with the
other formatting operations.

Eli
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[Python-Dev] [Python-checkins] cpython: Issue #11049: adding some tests to test.support