[Python-Dev] PEP 3101: floats format 'f' and 'F'
eric+python-dev at trueblade.com
Wed Jul 16 19:30:24 CEST 2008
Guido van Rossum wrote:
> On Wed, Jul 16, 2008 at 7:35 AM, Eric Smith
> <eric+python-dev at trueblade.com> wrote:
>> Does anyone know why 'F' is the same as 'f'? Wouldn't it make more sense to
>> either drop it, or make it convert the exponent to upper case (like 'E' and
>> 'G')? Compatibility with %-formatting is the only reason I can think of to
>> keep up, but I get the sense we've given up on an automatic conversion from
>> %-formatting to str.format(). Plus, I can find no uses of '%F' in the
>> standard library.
> My best guess as to why 'F' is the same as 'f' is that somebody
> (could've been me :-) thought, like several others in this thread,
> that %f never prints an exponent. I agree that making it emit an 'E'
> when an exponent is used is the right thing to do. Do it now!
It shares code with %-formatting. Change that, too? I couldn't find
any occurrences of %F in the stdlib. Not that that's the entire
universe, of course.
The change is slightly less elegant if I don't change %-formatting, but
still doable, especially if the betas don't get cut today.
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