[Python-Dev] [Python-checkins] peps: PEP 460: add .format_map()
ncoghlan at gmail.com
Fri Jan 10 16:20:06 CET 2014
On 10 January 2014 07:41, Eric V. Smith <eric at trueblade.com> 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.
> On 1/9/2014 4:02 PM, antoine.pitrou wrote:
>> changeset: 5341:8947cdc6b22e
>> user: Antoine Pitrou <solipsis at pitrou.net>
>> date: Thu Jan 09 22:02:01 2014 +0100
>> PEP 460: add .format_map()
>> 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()``.
>> 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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Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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