On 8 September 2015 at 19:15, Oscar Benjamin oscar.j.benjamin@gmail.com wrote:
ATM the colon separates the part of the format element that is interpreted by the format method to find the formatted object from the part that is passed to the __format__ method of the formatted object. Perhaps an additional colon could be used to separate the separator for when the formatted object is an iterable so that
'foo {name:<fmt>:<sep>} bar'.format(name=<expr>)could become
'foo {_name} bar'.format(_name = '<sep>'.join(format(o, '<fmt>')for o in <expr>))
The example would then be
>>> '{:.1f}, {:.1f:, }'.format(99, range(10)) '99.0, 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0'
Except that obviously that wouldn't work because colon can be part of the <fmt> string e.g. for datetime:
>>> '{:%H:%M}'.format(datetime.datetime.now()) '19:39'
So you'd need something before the colon to disambiguate. In which case perhaps
'foo {*name:<sep>:<fmt>} bar'.format(name=<expr>)
meaning that if the * is there then everything after the second colon is the format string.
Then it would be:
>>> '{:.1f}, {*:, :.1f}'.format(99, range(10)) '99.0, 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0'
-- Oscar