On Friday, 4 January 2019 14:57:53 GMT Łukasz Stelmach wrote:
> Hi,
>
> I would like to present two pull requests[1][2] implementing fixed point
> presentation of numbers and ask for comments. The first is mine. I
> learnt about the second after publishing mine.
>
> The only format using decimal separator from locale data for
> float/complex/decimal numbers at the moment is "n" which behaves like
> "g". The drawback of these formats, I would like to overcome, is the
> inability to print numbers ranging more than one order of magnitude with
> the same number of decimal digits without "manually" (with some additional
> custom code) adjusting precission. The other option is to "manually"
> replace "." as printed by "f" with a local decimal separator. Neither of
> these option is appealing to my.
>
> Formatting 1.23456789 * n (LC_ALL=3Dpl_PL.UTF-8)
>
> | n | ".2f" | ".3n" |
> |
> |---+----------+----------|
> |
> | 1 | 1.23 | 1,23 |
> | 2 | 12.35 | 12,3 |
> | 3 | 123.46 | 123 |
> | 4 | 1234.57 | 1,23e+03 |
Can you use locale.format_string() to solve this?
I used this to test:
import locale
n = 1.23456789
for order in range(5):
m = n * (10**order)
for lang in ('en_GB.utf8', 'pl_PL.utf8'):
locale.setlocale(locale.LC_ALL, lang)
print( 'python %%.2f in %s: %.2f' % (lang, m) )
print( locale.format_string('locale %%.2f in %s: %.2f', (lang, m),
grouping=True) )
print()
Which outputs:
python %.2f in en_GB.utf8: 1.23
locale %.2f in en_GB.utf8: 1.23
python %.2f in pl_PL.utf8: 1.23
locale %.2f in pl_PL.utf8: 1,23
python %.2f in en_GB.utf8: 12.35
locale %.2f in en_GB.utf8: 12.35
python %.2f in pl_PL.utf8: 12.35
locale %.2f in pl_PL.utf8: 12,35
python %.2f in en_GB.utf8: 123.46
locale %.2f in en_GB.utf8: 123.46
python %.2f in pl_PL.utf8: 123.46
locale %.2f in pl_PL.utf8: 123,46
python %.2f in en_GB.utf8: 1234.57
locale %.2f in en_GB.utf8: 1,234.57
python %.2f in pl_PL.utf8: 1234.57
locale %.2f in pl_PL.utf8: 1 234,57
python %.2f in en_GB.utf8: 12345.68
locale %.2f in en_GB.utf8: 12,345.68
python %.2f in pl_PL.utf8: 12345.68
locale %.2f in pl_PL.utf8: 12 345,68
Barry
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