Thanks Ethan, this mostly looks excellent.
On 23 February 2014 11:56, Ethan Furman <[email protected]> wrote:
> ``%a`` will call :func:``ascii()`` on the interpolated value's
> :func:``repr()``.
> This is intended as a debugging aid, rather than something that should be
> used
> in production. Non-ascii values will be encoded to either ``\xnn`` or
> ``\unnnn``
> representation.
Is this really what is intended? It seems to me that what is needed is
to just call ascii(), which is inherently based on repr():
>>> ascii(1)
'1'
>>> ascii("1")
"'1'"
>>> ascii(b"1")
"b'1'"
The current wording in the PEP effectively suggests invoking repr()
twice, which is just weird:
>>> ascii(repr(1))
"'1'"
>>> ascii(repr("1"))
'"\'1\'"'
>>> ascii(repr(b"1"))
'"b\'1\'"'
And inconsistent with the meaning of %a in text interpolation:
>>> ("%a" % 1).encode("ascii")
b'1'
> Open Questions
> ==============
>
> It has been suggested to use ``%b`` for bytes as well as ``%s``.
>
> - Pro: clearly says 'this is bytes'; should be used for new code.
>
> - Con: does not exist in Python 2.x, so we would have two ways of doing
> the
> same thing, ``%s`` and ``%b``, with no difference between them.
Another con is that using %b this way would be inconsistent with the
"b" numeric format code that requests binary output:
>>> format(2, "b")
'10'
>>> format(2, "#b")
'0b10'
So -1 for "%b" from me on both TOOWTDI and consistency grounds.
Cheers,
Nick.
--
Nick Coghlan | [email protected] | Brisbane, Australia
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