[Python-Dev] RFC: PEP 460: Add bytes % args and bytes.format(args) to Python 3.5 (original) (raw)

Brett Cannon brett at python.org
Mon Jan 6 15:13:14 CET 2014

On Mon, Jan 6, 2014 at 8:44 AM, Antoine Pitrou <solipsis at pitrou.net> wrote:

Hi, On Mon, 6 Jan 2014 14:24:50 +0100 Victor Stinner <victor.stinner at gmail.com> wrote: > > The PEP is a draft with open questions. First, I'm not sure that both > bytes%args and bytes.format(args) are needed. The implementation of > .format() is more complex, so why not only adding bytes%args? I think we must either implement both or none of them.

Or bytes.format() only. But I do agree that only implementing the % operator is the wrong answer.

-Brett

> Then, > the following points must be decided to define the complete list of > supported features (formatters): > > * Format integer to hexadecimal? %x and %X > * Format integer to octal? %o > * Format integer to binary? {!b} > * Alignment? > * Truncating? Truncate or raise an error? Not desirable IMHO. bytes formatting should serve mainly for templating situations (i.e. catenate and insert bytestrings into one another). We cannot start giving text-like semantics to bytes objects without confusing non-experts. > * format keywords? b'{arg}'.format(arg=5) > * str % dict ? b'%(arg)s' % {'arg': 5) Yes, bytes formatting must support the same calling conventions as str formatting. BTW, there's a subtlety here: %s currently means "insert the result of calling str", but bytes formatting should not call str. > * Floating point number? > * %i, %u and %d formats for integer numbers? > * Signed number? %+i and %-i No, IMHO. Regards Antoine.

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