[Python-ideas] Addition to operator module: starcaller

[Emanuel Barry]

Hello,
You’re presumably doing something like ‘star = starcaller(f); star((“foo”, “bar”, “baz”))’ – how is it different from ‘f(*(“foo”, “bar”, “baz”))’ ? I don’t see any difference…

-Emanuel

From: Python-ideas [mailto:python-ideas-bounces+vgr255=live.ca at python.org] On Behalf Of Daniel Spitz
Sent: Thursday, July 21, 2016 10:07 AM
To: python-ideas at python.org
Subject: [Python-ideas] Addition to operator module: starcaller

Hello,

I have run into a use case where I want to create a wrapper object that will star-unpack a sequence of arguments to pass to a function. Currently one way to construct this is to create a function:

def starcaller(f):
    def wrapper(args):
        return f(*args)
    return wrapper

Such a function feels simple enough, and specific enough to the language, that it would fit in well in the operator module of the standard library. We already have a similar representation of this functionality in itertools.starmap.

Whereas the nested function implementation above will produce unpickleable objects (due to the closure), a straightforward c implementation will produce pickleable ones, making them useful for parallel applications.

Thanks,
Dan Spitz
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