在一行中解包函数返回值到单个值和元组

Question

I often use library functions which return many values in a tuple:

def f():
    return "a", "b", "c", "d"

Is it possible to (in a single step) unpack the first value while keeping the rest in a tuple? Ie do this:

ret = f()
a, b_to_d = ret[0], ret[1:]

but in one line.

Answer 1

Yes, using the * syntax below:

>>> def f():
...  return 1,2,3,4
...
>>> a,*b = f()
>>> a
1
>>> b
[2, 3, 4]
>>> a,*b,c = f()  # * can be used in other positions, too
>>> a,b,c
(1, [2, 3], 4)