[Python-ideas] Rough draft: Proposed format specifier for a thousands separator (discussion moved from python-dev)
python at rcn.com
Thu Mar 12 20:51:07 CET 2009
> Fair enough. But what does a thousands separator provide that the "n"
> type doesn't already provide? (Well, except that n isn't as well
> known -- but initially this won't be either.)
It's nice to be have a non-locale aware alternative so you can say
explicitly what you want. This is especially helpful in Guido's example
where you need to format for a different locale than the one that is
currently on your machine (i.e. the global state doesn't match the target).
FWIW, C-Sharp provides both ways, a locale aware "n" format and
a hard-wired explicit thousands separator. See the updated PEP for
examples and a link.
> Do you want to avoid using locale even in the background?
I thought locale was always there.
> Do you want to avoid having to set a locale in the program startup?
Yes. I don't think most casaul users should have to figure that out.
It's a little to magical and arcane:
>>> import local
>>> locale.setlocale(locale.LC_ALL, 'English_United States.1252')
> Do you want a better default for locale?
The default does suck:
>>> format(1237, "n")
> Do you really want a different type, such as "m" for money?
I don't but I'm sure someone does. I did write a money formatter
sample recipe for the decimal docs so people would have something
to model from.
FWIW, I've always thought it weird that the currency symbol could
shift with a locale setting. ISTM, that if you change the symbol, you
also have to change the amount that goes with it :-)
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