Question

Given a Python tuple t = v1, v2, v3 is there a utility to unpack these so that given:

def foo(v1,v2,v3): pass

Instead of this:

foo(t[0],t[1],t[2])

You can do this:

foo(unpack(t))

I’d like to know of any such utility available for tuples and/or lists.

Sincere thanks.

Answer 1

Yep. You can use the unpacking operator ('*')

foo(*t)

Note that this works if t is a list, tuple, or even a generator

---

There’s an analogous way to pass arguments to functions with keywords using the ** operator on mapping objects (typically dictionaries):

def foo(key=None,foo=None):
    pass #...

foo(**{key:1,foo:2})