On 10 January 2014 07:41, Eric V. Smith wrote:

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.

It's purely a matter of consistency with str - if we're adding binary interpolation back to Python 3 (which I have been persuaded is a good idea), then we should provide the same three typical spellings of the operation that str provides. Cheers, Nick.

Eric.

On 1/9/2014 4:02 PM, antoine.pitrou wrote:

...

http://hg.python.org/peps/rev/8947cdc6b22e changeset: 5341:8947cdc6b22e user: Antoine Pitrou 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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