How to extract parameters from a list and pass them to a function call

Question

What is a good, brief way to extract items from a list and pass them as parameters to a function call, such as in the example below?

Example:

def add(a,b,c,d,e):
    print(a,b,c,d,e)

x=(1,2,3,4,5)

add(magic_function(x))

||

Answer 1

I think you mean the * unpacking operator:

>>> l = [1,2,3,4,5]
>>> def add(a,b,c,d,e):
...    print(a,b,c,d,e)
...
>>> add(*l)
1 2 3 4 5

Answer 2

You can unpack a tuple or a list into positional arguments using a star.

def add(a, b, c):
    print(a, b, c)

x = (1, 2, 3)
add(*x)

Similarly, you can use double star to unpack a dict into keyword arguments.

x = { 'a': 3, 'b': 1, 'c': 2 }
add(**x)

Answer 3

Use the * operator. So add(*x) would do what you want.

See this other SO question for more information.

Answered By: arunkumar

Question: