[Python-Dev] Partial function application 'from the right'

[Antoine Pitrou]

Hello,

Ben North <ben <at> redfrontdoor.org> writes:
> 
> I find 'functools.partial' useful, but occasionally I'm unable to use it
> because it lacks a 'from the right' version.  E.g., to create a function
> which splits a string on commas, you can't say
> 
>    # Won't work when called:
>    split_comma = partial(str.split, sep = ',')

In py3k, we could also use "..." (the Ellipsis object) to denote places where an
argument is missing, so that:

    split_comma = partial(str.split, ..., ',')

would do what you want.

Regards

Antoine.