[Python-Dev] PEP 3101: floats format 'f' and 'F' (original) (raw)

Eric Smith eric+python-dev at trueblade.com
Thu Jul 17 17:38:41 CEST 2008

Eric Smith wrote:

Guido van Rossum wrote:

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. Fine with me to change %F as well -- after all that's where the misunderstanding comes from. (More and more I'm beginning to think it was my mistake. :-) I added this as http://mail.python.org/pipermail/python-dev/2008-July/081242.html I should be able to get it checked in today.

I have this ready for checkin (with docs and tests). I'd like to get it in for this beta, since it does involved changed behavior, no matter how small ('1e+100' becomes '1E+100' with '%F'). But it relies on the platform's vsnprintf to do the right thing with 'F', so I'm worried about breakages on platforms I don't have access to. Resolving those issues might take a few days.

Any advice on checking this in now, or waiting until after this beta is released?

On a related note, I've wanted to clean up float formatting for ages. The test: if ((type == 'f' || type == 'F') && (fabs(x) / 1e25) >= 1e25) is in the code in 3 places, for example. I'm hoping I can get to that project, but since it won't change functionality I can do it later.

Eric.

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