python

Python3 Advance Unpacking

Written on May 04, 2017 | Tags: python

Advance Unpacking

>>> a, b, *rest = range(10)
>>> a
0
>>> b
1
>>> rest
[2, 3, 4, 5, 6, 7, 8, 9]

Or you can put range in the middle

>>> a, *rest, b = range(10)
>>> a
0
>>> b
9
>>> rest
[1, 2, 3, 4, 5, 6, 7, 8]

Or get the first and last lines of a file

>>> with open("using_python_to_profit") as f:
...     first, *_, last = f.readlines()
>>> first
'Step 1: Use Python 3\n'
>>> last
'Step 10: Profit!\n'

Or to refactor your functions

def f(a, b, *args):
    # stuff

def f(*args):
    a, b, *args = args
    # stuff

Reference: 10 awesome features of Python that you can’t use because you refuse to upgrade to Python3