Add unpack decorator

[ADR-007]

I propose to add a decorator which will unpack argument:

    def process(foo, bar):
        ...
    
    map(unpack(process), product(['foo1', 'foo2'], ['bar1', 'bar2']))

Is it a funcy way?

[Suor]

Look at itertools.starmap(), it covers your use case.

[ADR-007]

Actually, no.
I have code like this pool.imap_unordered(unpack(process), iterable).

But you are right: in other cases, I can use starmap. So this function is very specific and I don't know whether it is a good idea add it to funcy.

[Suor]

If process() is your function you can just unpack in a body, this narrows use cases. I agree that general usability is questionable. Other considerations (if we are going to add it) are name and keyword args support, which slows down the more common case.

So I let it hang for a while, let's see if anyone else wants it.

[ADR-007]

Yes, process() is my own function, but I don't want to change it.

Other considerations (if we are going to add it) are name and keyword args support, which slows down the more common case.

So I let it hang for a while, let's see if anyone else wants it.

I agree

[taleinat]

I just ran into a case where this could have been used. Unpacking the arguments in other ways is simple and readable enough that I don't think adding this is worthwhile.

[cardoso-neto]

As the mention above indicates, I ran into a case where this could be useful on a function composition pipeline if one of the fucntions returned a tuple with the arguments the next function needs, we could wrap the next function with the unpack() decorator.