On 2014-01-13 21:51, Guido van Rossum wrote:
Terminology. Let's use the official terminology rather than making stuff up.
The docs at http://docs.python.org/3/library/string.html#formatspec
use the following terminology:
Replacement field: {...}; contains field name, conversion, format spec
in that order, all optional.
Field name: either a decimal integer (referring to an argument by
position) or an identifier (by name), or omitted (uses the next
available position).
Conversion: !r, !s, !a; these refer to repr(), str(), ascii() to the
value, and then the format spec applies to the resulting string.
If all you wanted to do was interpolate bytes then you could define a
new conversion !b. This would, however, mean that the format spec would
be applied to bytes.
Format spec: colon, bunch of stuff, type; the type is a letter such as
d (decimal) or s (string), and the stuff between the colon and the
type is used to specify field width, alignment, sign, padding and
such.
Also. {:b} means binary (i.e. numbers in base 2). I'm not sure what
this leaves for interpolating bytes if we don't want to use {:s}. The
docs at
http://docs.python.org/3/library/stdtypes.html#printf-style-string-formatting
don't show %b so it could still be used there, but it would be nicer
to be consistent.
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