Duh clear solution for Completely Empty by StefanPochmann - python coding challenges

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Duh solution in Clear category for Completely Empty by StefanPochmann

def completely_empty(val):
    try:
        return all(map(completely_empty, val))
    except:
        return False

July 13, 2017

Comments:

flpo on July 13, 2017, 2:28 p.m.
Very nice! +5! I think I know why you removed your upvote from my solution. Maybe because of <a href="https://py.checkio.org/mission/completely-empty/publications/flpo/python-3/first/share/612979df6ff06e35507119dbe268c076/#comment-54159">this</a>? :)

StefanPochmann on July 13, 2017, 2:45 p.m.
Haha, no, sorry about that. I didn't really want to upvote in the first place. I just thought I was shown my own solution (because yours looks similar and a bit earlier mine was the only solution) and was surprised to be offered to upvote my own solution. So I tried that in order to possibly report it as a bug. Then I realized it wasn't my solution. I took the upvote back because I don't vote when I don't have enough solutions to compare to and because I actually don't fully understand the problem yet, so I don't know whether your solution (or mine) is correct.

StefanPochmann on July 14, 2017, 12:02 p.m.
About the last part: By now I think I do understand the problem and that this solution is correct. And given how @veky rewrote the problem and how he <a href="https://py.checkio.org/forum/post/11283/new-mission-completely-empty/#comment-54071">asked about his solution</a>, I wouldn't be surprised if that solution is the same as mine. (Is it? :-))

StefanPochmann on July 14, 2017, 12:08 p.m.
Hmm, something's broken (see image in case it's not broken for you). My actual post says "About the last part: By now I think ...".

flpo on July 14, 2017, 2:07 p.m.
Yes, it is! That's why my +5! <a href="https://py.checkio.org/mission/completely-empty/publications/flpo/python-3/completely_empty-lambda-args-globalscompletely_emptyargs/">Here</a> the same solution, just a bit more twisted.

StefanPochmann on July 14, 2017, 6:01 p.m.
Edit: I just noticed that your link probably didn't get me to where you intended me to get but to a random solution (because of the Random Review thing). So the below applies to some other solution. And I don't even know how to identify your solution as yours even if I see it while browsing through the random solutions. Sigh. No, that's not the same. It's incomplete and fails this test: ``` <blockquote> <blockquote> <blockquote> class C: getitem = [[]].getitem completely_empty(C()) False ``` Even though the only thing in it is an empty list: ``` for x in C(): print(x) </blockquote> </blockquote> </blockquote> [] <blockquote> <blockquote> <blockquote> ``` You're <a href="https://docs.python.org/3/library/collections.abc.html#collections.abc.Iterable">only checking for `iter`</a>, not <a href="https://docs.python.org/3/glossary.html#term-iterable">also `getitem`</a>. </blockquote> </blockquote> </blockquote>

flpo on July 14, 2017, 6:53 p.m.
That's the linked solution: <pre class='brush: python'>from functools import wraps, partial def try_or_false(func): @wraps(func) def wrapper(*args, **kwargs): try: return func(*args, **kwargs) except: return False return wrapper compose = lambda g, f: lambda *args: g(f(*args)) completely_empty = lambda *args: globals()['completely_empty'](*args) completely_empty = try_or_false(compose(all, partial(map, completely_empty))) </pre>

StefanPochmann on July 14, 2017, 7:27 p.m.
You said it's "just a bit more twisted"... I don't think you know what "a bit" means :-P

veky on July 17, 2017, 2:54 p.m.
Try it on a numpy array. :-P Empty excepts are not ok, not even here. :-]

StefanPochmann on July 17, 2017, 3:02 p.m.
Ok I tried it on a numpy array. What about it? Worked fine.

veky on July 17, 2017, 3:58 p.m.
Hmm... someone told me that when you ask a numpy array for a truth value, it raises ValueError. <a href="https://stackoverflow.com/questions/22646463/difference-between-and-boolean-vs-bitwise-in-python-why-difference-i/22653528">https://stackoverflow.com/questions/22646463/difference-between-and-boolean-vs-bitwise-in-python-why-difference-i/22653528</a>#22653528

StefanPochmann on July 17, 2017, 6:27 p.m.
Yeah, but... I'm not doing that.

veky on July 19, 2017, 8:37 a.m.
Ah, yes. I must be getting old. :-D

StefanPochmann on July 19, 2017, 7:36 p.m.
Haha, I had actually considered adding "You're getting old", might've even typed it already. But decided against it, as I'm trying to become more polite...

veky on July 20, 2017, 4:36 a.m.
Good luck with that. ;-P

StroamCR on Jan. 3, 2018, 7:20 a.m.
Edit: Huh, so all() returns True when its input is empty. Who would have thunk it... I'm a little confused by this... I understand how return False is passed back up the recursion, but how does this function ever return True?

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