Author gvanrossum
Recipients arjennienhuis, benjamin.peterson, christian.heimes, eric.smith, exarkun, ezio.melotti, gvanrossum, loewis, martin.panter, pitrou, serhiy.storchaka, terry.reedy, uau, vstinner
Date 2013-01-22.19:32:27
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Well, msg171804 makes it a much bigger project than the feature that Twisted actually needs.  Quoting:

* The default formatting should not use str(), but buffer protocol.

* There is no place for floating point.
Actually they do need it -- and it's trivial to define, since fp only returns ASCII characters.

* There is no place for locale.

* There is no place for 'r' conversion (possible only for 'a').

* It should include the features of struct.pack(), int.to_bytes() and ctypes.
Not needed.

* Padding should be not only by space, but also by zeros (and possibly by other values).
Not needed.

* Alignment (padding to position divisible by some number).
Not needed.

* In addition to padding and truncating should be the ability to raise an exception in case of discrepancy between the needed and actual lengths.
Not needed.

* It unlikely needed attribute access and indexing.
I don't know, but these features certainly would be well-defined.

* Builtin format() should not work with this.

Probably bytes.format() should not try to call v.__format__(); if an extension mechanism is needed it would be called something else, but given the limited set of types needed I think this can be skipped.

The most important requirement from Twisted is actually that it is called .format(), and that the overall format strings look like they did for 8-bit string formatting in Python 2.  In particular b'a{}b{}c'.format(x, y), where x and y are bytes, should be equivalent to b'a' x + b'b' + y + b'c'.
Date User Action Args
2013-01-22 19:32:28gvanrossumsetrecipients: + gvanrossum, loewis, terry.reedy, exarkun, pitrou, vstinner, eric.smith, christian.heimes, benjamin.peterson, ezio.melotti, arjennienhuis, uau, martin.panter, serhiy.storchaka
2013-01-22 19:32:28gvanrossumsetmessageid: <>
2013-01-22 19:32:28gvanrossumlinkissue3982 messages
2013-01-22 19:32:27gvanrossumcreate