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On 30 March 2015 at 13:49, Stefan Krah wrote:
> Regarding Decimal:
>
> 1) The context precision isn't used for formatting. If you have
> another reason for proposing the optional context argument for
> dec_format(), please open another issue.
Yes, context precision isn't, but context rounding mode is. That's why
I wanted to use a known context rather than the current (thread-local)
context.
But yes, I also thought that maybe the Decimal.__format__ changes
should go to another issue, which my implementation would then depend
on though. It wouldn't be too bad if Py and C version of
Decimal.__format__ had same interface. What do you think?
> 2) There's another problem: The mythical DefaultContext (which
> acts as a template for creating new contexts) affects not only
> new thread-local contexts, but also a new Context()!
>
> In my opinion this is something we should change: The mechanism
> is fine for thread-local contexts, but Context() should behave
> like a pure function.
I don't understand what do you mean with this. Is this something that
I'm doing wrong in my patch or just another (related?) issue?
> 3) The double rounding issues are more tricky than it might seem;
> if we use Decimal for this, perhaps direct support in the module
> would be the cleanest option.
What double rounding issues you're referring to?