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Mon Jan 6 14:54:17 CET 2014 · http://mail.python.org/pipermail/python-dev/2014-January/130925.html

On Tue, Jan 7, 2014 at 12:44 AM, Antoine Pitrou <solipsis at pitrou.net> wrote:
> BTW, there's a subtlety here: ``%s`` currently means "insert the result
> of calling __str__", but bytes formatting should *not* call __str__.

Since it derives from the C printf notation, it means "insert string
here". The fact that __str__ will be called is secondary to that. I
would say it's not a problem for bytes formatting to call __bytes__,
or in some other way convert to bytes without calling __str__.

Will it be confusing to have bytes and str supporting distinctly
different format operations? Might it be better to instead create a
separate and very different method on a bytes, just to emphasize the
difference?

ChrisA

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Showing content from http://mail.python.org/pipermail/python-dev/2014-January/130925.html below:

[Python-Dev] RFC: PEP 460: Add bytes % args and bytes.format(args) to Python 3.5