How can I unpack sequence?

Question

Why can't I do this:

d = [x for x in range(7)] 
a, b, c, d, e, f, g = *d

Where is it possible to unpack? Only between parentheses of a function?

Answer 1

You're using Extended Iterable Unpacking in wrong way.

d = [x for x in range(7)]  
a, b, c, d, e, f, g = d
print(a, b, c, d, e, f, g)

Where it's possible to unpack? Only between parentheses of a function?

No,

* proposes a change to iterable unpacking syntax, allowing to specify a "catch-all" name which will be assigned a list of all items not assigned to a "regular" name.

You can try something like this:

a, *params = d
print(params)

Output

[1, 2, 3, 4, 5, 6]

Usually * ( Extended Iterable Unpacking ) operator is used when you need to pass parameters to a function.

Note

Javascript equivalent of Extended Iterable Unpacking operator is called spread syntax .

 d = [...Array(7).keys()] console.log(d) var [a, ...b] = d console.log(a,b) 

Answer 2

You can also use this:

>>> a,b,c,d,e,f,g = range(7)
>>> a
0
>>> b
1
>>> c
2

Answer 3

You don't appear to need the *

>>> z = [x for x in range(7)]
>>> a,b,c,d,e,f,g = z
>>> a
0
>>> b
1
>>> c
2
>>> 

(I've used z rather than d twice.)