Hacker News Reader

Comment by OJFord | Hacker News Reader

Not GP, but it's _very_ limited.

Off the top of my head, things you can't do:

    # nested unpacking
    (a, b), c = ((1, 2), 3)

    # destructuring arguments
    (lambda (a, b): None)((1, 2))

View on HN

First example works fine in both Python 2 and 3. Second example works in Python 2.7 and earlier, but tuple unpacking for arguments was removed in Python 3. [1]

[1] https://www.python.org/dev/peps/pep-3113/

For your second example, you need to unpack your parameters.

    (lambda x, y: None)(*(1, 2))

Unless you're saying you should be able to define the set size you pass in.

Yes, it was an example of something you _can't_ do.

Both of these were intentionally removed around Python 3, iirc: python 2.7 allows nested tuple/list destructuring as well as destructuring in function arg lists.

Reply on news.ycombinator.com