[issue7094] Add alternate float formatting styles to new-style formatting.
Seungbeom Kim added the comment: It looks like this change has not been applied to Python 2.7. Do we have any chance of getting it to 2.7? So I'm unsure if anyone is actually using alternate formatting. The alternative form is my favorite, and I think that %#g should be the default format for general floating-point values in numerical applications. That is why I miss this feature in Python 2.7 so much. -- nosy: +Seungbeom Kim ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Terry J. Reedy added the comment: New features only go in new versions. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Changes by Ezio Melotti ezio.melo...@gmail.com: -- stage: patch review - resolved ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Eric V. Smith added the comment: I'm going to go ahead and close this. Alternate formatting was added to float and complex. I think leaving this issue open just confuses whether or not that support was added. I know I had to go back and double check. Since decimal never participated in %-formatting, there are no migration to .format() issues with it. I agree that it's unlikely anyone would want it, and if we want to add it, it would be a new, separate issue. -- resolution: later - fixed status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Stefan Krah added the comment: This might be out of date: _decimal has never implemented alternate formatting and so far there have been no reported issues. Another data point: Go apparently implements alternate formatting only for octal, hex and strings: http://golang.org/pkg/fmt/ So I'm unsure if anyone is actually using alternate formatting. I think complaints about 2-to-3 porting problems should have surfaced by now. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Raymond Hettinger added the comment: So I'm unsure if anyone is actually using alternate formatting. That makes sense. Any further effort should wait until there is known demand. Otherwise, we risk growing the API with codes that aren't used. -- resolution: - later versions: +Python 3.5 -Python 3.2 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Changes by Mark Lawrence breamore...@yahoo.co.uk: -- nosy: -BreamoreBoy ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Mark Lawrence added the comment: @Eric looks as if the bulk of the work has been done so would you like to dot the i's and cross the t's? -- nosy: +BreamoreBoy ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Eric Smith e...@trueblade.com added the comment: Checked in r86751. I'm leaving this open until I fix the remaining issue with '#g' for Decimal. -- components: +Library (Lib) ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Changes by Eric Smith e...@trueblade.com: -- stage: unit test needed - patch review ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Changes by Eric Smith e...@trueblade.com: Removed file: http://bugs.python.org/file19722/issue7094.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Eric Smith e...@trueblade.com added the comment: Updated patch. I'm pretty happy with this one and will commit it after review. -- Added file: http://bugs.python.org/file19753/issue7094.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Mark Dickinson dicki...@gmail.com added the comment:
I haven't done a full review, but this looks good at first glance.
For '#g' formatting on the Decimal type, I wonder whether the patch gives the
right semantics. E.g., should
format(Decimal('1.23'), '#.6g')
give '1.23' or '1.23000'? For the float type, the '#.precisiong' formatting
has the property that precision digits are always returned, and I think this
may be what we want here. I'm not sure, though.
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[issue7094] Add alternate float formatting styles to new-style formatting.
Mark Dickinson dicki...@gmail.com added the comment: I think the change below is sufficient if we decide that the '#g' formatting should always have the given number of significant digits. --- Lib/decimal.py (revision 86635) +++ Lib/decimal.py (working copy) @@ -3701,7 +3701,8 @@ self = self._round(precision+1, rounding) elif spec['type'] in 'fF%': self = self._rescale(-precision, rounding) -elif spec['type'] in 'gG' and len(self._int) precision: +elif spec['type'] in 'gG' and (len(self._int) precision or + spec['alt']): self = self._round(precision, rounding) # special case: zeros with a positive exponent can't be # represented in fixed point; rescale them to 0e0. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Mark Dickinson dicki...@gmail.com added the comment: Gah. That doesn't work for zeros, though. Apart from this, the rest of the patch looks good, and all tests pass on my machine. (Well, except for test_urllib2_localnet, but I'm pretty sure that failure is unrelated.) I hadn't realized the use_alt_formatting stuff was already present in Python/pystrtod.c. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Eric Smith e...@trueblade.com added the comment: I didn't realize it either, or I would have done this patch months ago. But of course it's needed for %-formatting. I'll consider the 'g' case and see what I come up with. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Eric Smith e...@trueblade.com added the comment:
I agree that:
format(Decimal('1.23'), '#.6g')
should give '1.23000', just as:
format(1.23, '#.6g')
does.
I'll work on fixing the patch, although if I don't get to it in the next few
days I'll commit the existing patch and open another issue, just to make sure
this gets in before the beta.
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[issue7094] Add alternate float formatting styles to new-style formatting.
Eric Smith e...@trueblade.com added the comment: Also note that if # is added for float and Decimal, it should be added for complex. My Bug Day sprint group will have a patch for this shortly. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Eric Smith e...@trueblade.com added the comment: This is the patch developed today at the DCPython sprint. I have not reviewed it very well. I know that at least: - formatting is not consistent - the docs need reviewing - I want to add more tests - Misc/NEWS and Misc/ACKS need updating But I'm uploading it here anyway so that it doesn't get lost. I'll be refining the patch over the next several days. The patch covers float, complex, and decimal. Thanks to: Eric Groo Vlad Korolev Bob Schmertz Owen Martin -- keywords: +patch Added file: http://bugs.python.org/file19722/issue7094.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Raymond Hettinger rhettin...@users.sourceforge.net added the comment: I do not believe that this is covered by the moratorium. It's important for 3.x success to get new string formatting to its highest state of usability. Matching published standards and practices(i.e. C99) and improving ability to convert from old-style to new style are both very helpful in this regard. -- nosy: +rhettinger versions: +Python 3.2 -Python 3.3 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Terry J. Reedy tjre...@udel.edu added the comment: I believe this is covered by the PEP3003 3.2 change moratorium. -- nosy: +terry.reedy versions: +Python 3.3 -Python 2.7, Python 3.2 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Eric Smith e...@trueblade.com added the comment: When and if this is implemented, there's a test in test_float.py that needs to be deleted. Search on if not '#' in fmt:, added in r76632. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
New submission from Mark Dickinson dicki...@gmail.com: Python's old-style formatting supports the use of an alternative form (specified by including a '#' in the format) for 'e', 'f' and 'g' formatting: Python 3.2a0 (py3k:75275:75276, Oct 7 2009, 20:26:36) [GCC 4.0.1 (Apple Inc. build 5493)] on darwin Type help, copyright, credits or license for more information. '%.17g' % 1.2 '1.2' '%#.17g' % 1.2 '1.2000' New-style formatting doesn't currently support this: format(1.2, '#.17g') Traceback (most recent call last): File stdin, line 1, in module ValueError: Alternate form (#) not allowed in float format specifier To aid migration from old-style to new-style formatting, it might be worth adding the alternate forms. At least the float, complex and Decimal types would be affected. -- components: Interpreter Core messages: 93807 nosy: eric.smith, mark.dickinson severity: normal stage: test needed status: open title: Add alternate float formatting styles to new-style formatting. type: feature request versions: Python 3.2 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Eric Smith e...@trueblade.com added the comment: I'm adding 2.7. Since 2.7 and 3.2 share the same code base, I'd rather add it to both if we're going to do it at all. -- assignee: - eric.smith versions: +Python 2.7 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7094] Add alternate float formatting styles to new-style formatting.
Mark Dickinson dicki...@gmail.com added the comment: Just for reference, the effect of the alternative style is explained succinctly in the C99 standard (well, the N1256 draft, anyway): For a, A, e, E, f, F, g, and G conversions, the result of converting a floating-point number always contains a decimal-point character, even if no digits follow it. (Normally, a decimal-point character appears in the result of these conversions only if a digit follows it.) For g and G conversions, trailing zeros are not removed from the result. For other conversions, the behavior is undefined. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7094 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
