How to pass tuple to function as separate variables

Question

When returning multiple variables from a Python function, returning a tuple is the most convenient solution to me. However, it lacks convenience when chaining the return value with another function taking separate variables as input. For example, say we have

def foo():
    return (1,2)

def sum(a, b):
    return a+b

And in this case, the following chaining doesn't work

sum(foo())

I know one solution, namely to change the function sum to take a tuple as input rather than 2 vars, i.e.

def sum2((a, b)):
    return a+b

Now the chaining sum2(foo()) works, but it's a bit awkward, isn't it? I wound rather change foo() because sum() might has been used by others. What is a nice solution to this?

@tom10 Oh, looks like I missed Python 101..What's the name for this? dereference? — qweruiop
– qweruiop, Commented Jul 23, 2015 at 2:46

Anand S Kumar · Accepted Answer · 2015-07-23 02:46:03Z

5

You are looking for unpacking. You should try -

sum(*foo())

answered Jul 23, 2015 at 2:46

Anand S Kumar

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