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Thu Jan 9 22:41:55 CET 2014 · https://mail.python.org/pipermail/python-dev/2014-January/131114.html

I'm not sure how format_map helps in porting from 2 to 3, since it
doesn't exist in any version of 2.

Although that said, it's no doubt a useful feature, just not useful in
code that supports both 2 and 3 with a single code base or when porting
to 3.

Eric.

On 1/9/2014 4:02 PM, antoine.pitrou wrote:
> http://hg.python.org/peps/rev/8947cdc6b22e
> changeset:   5341:8947cdc6b22e
> user:        Antoine Pitrou <solipsis at pitrou.net>
> date:        Thu Jan 09 22:02:01 2014 +0100
> summary:
>   PEP 460: add .format_map()
> 
> files:
>   pep-0460.txt |  6 +++++-
>   1 files changed, 5 insertions(+), 1 deletions(-)
> 
> 
> diff --git a/pep-0460.txt b/pep-0460.txt
> --- a/pep-0460.txt
> +++ b/pep-0460.txt
> @@ -24,12 +24,16 @@
>    similar in syntax to ``str.format()`` (accepting positional as well as
>    keyword arguments).
>  
> +* ``bytes.format_map(...)`` and ``bytearray.format_map(...)`` for an
> +  API similar to ``str.format_map(...)``, with the same formatting
> +  syntax and semantics as ``bytes.format()`` and ``bytearray.format()``.
> +
>  
>  Rationale
>  =========
>  
>  In Python 2, ``str % args`` and ``str.format(args)`` allow the formatting
> -and interpolation of bytes strings.  This feature has commonly been used
> +and interpolation of bytestrings.  This feature has commonly been used
>  for the assembling of protocol messages when protocols are known to use
>  a fixed encoding.
>  
> 
> 
> 
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[Python-Dev] [Python-checkins] peps: PEP 460: add .format_map()