Hi, Tim.
Your name came up frequently as a target for this use case. I think we’ve come
up with a pretty good solution.
Now if I could only convince my clients to upgrade from 2.7! I’ve heard about
these f-string things, and I think I would enjoy using them.
Eric
> On May 7, 2019, at 12:50 PM, Tim Peters <tim.pet...@gmail.com> wrote:
>
> [Larry Hastings <la...@hastings.org>]
>> Guido just stopped by--we're all at the PyCon 2019 dev sprints--and we had
>> a chat about it. Guido likes it but wanted us to restore a little of the
>> magical
>> behavior we had in "!d": now, = in f-strings will default to repr (!r),
>> unless
>> you specify a format spec. If you specify a format spec it will always
>> default
>> to format. And naturally if you specify an explicit conversion function (!r
>> !s !a)
>> it will use that.
>>
>> This makes !f irrelevant, so we're removing it.
>>
>> Here's the thinking: 99% of the time the user will just use {foo=}, and for
>> that
>> you want repr. After that, 0.99% of the time the user will want a format
>> spec
>> that applies directly the value. It's exceedingly unlikely that someone will
>> want a format spec, but want it to apply to repr(value) and not value
>> itself. So
>> that's possible (f'{foo=!r:20}'). But the default behavior is the most
>> common
>> case at every step.
>
> +1. Perfect! I'm one of the 0.99% who will frequently use this to
> display floats, and really wants them to show as "0.99%" rather than
> "0.9913499340289%".
>
> BTW, that Guido person has made enough decent contributions by now
> that I think he should be asked whether he wants to become a core dev!
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