How to use a tuple as an argument of a function

[buran]

Is this method as "correct" as *args and *kwargs?

It depend what you want to achieve. This is the correct method if you want to pass one argument (it may be tuple). It will take one and only one argument (it may or may not be the type you expect).

In your initial post you were asking something different, or at least I understood that you ask about arbitrary number of positional arguments - i.e. when you don't know in advance how many arguments you will get or want to allow arbitrary number. In your post:

I can call function(1,2,3)

Here you don't pass one tuple, but 3 positional arguments.

def spam(foo):
    print(foo)

foo = (1, 2, 3)
spam(foo)
spam(1, 2, 3)

Output:
(1, 2, 3)
Traceback (most recent call last):
  File "***", line 6, in <module>
    spam(1, 2, 3)
TypeError: spam() takes 1 positional argument but 3 were given

*args, **kwargs is often used in more complex cases, e.g. OOP with class inheritance