What's up, __doc__? creative solution for Boolean Algebra by veky - python coding challenges

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What's up, __doc__? solution in Creative category for Boolean Algebra by veky

def boolean(x, y, operation):
    '''\
    x | y | x∧y | x∨y | x→y | x⊕y | x≡y |
    --------------------------------------
    0 | 0 |  0  |  0  |  1  |  0  |  1  |
    1 | 0 |  0  |  1  |  0  |  1  |  0  |
    0 | 1 |  0  |  1  |  1  |  1  |  0  |
    1 | 1 |  1  |  1  |  1  |  0  |  1  |
    --------------------------------------'''
    symbol = dict(
        conjunction = "∧",
        disjunction = "∨",
        implication = "→",
        equivalence = "≡",
        exclusive = "⊕",
    )[operation]
    head, *body = boolean.__doc__.splitlines()
    for line in body:
        row = dict(zip(reversed(head), reversed(line)))
        if (row['x'], row['y']) == (str(x), str(y)): return int(row[symbol])

Sept. 6, 2014

Comments:

veky on Sept. 6, 2014, 2:28 a.m.
Thanks shota243 for the idea.

DiZ on Oct. 1, 2014, 10:19 p.m.
Magic method, great! Inspiring solution by the way (and +1 for the rabbit :D)

veky on Oct. 3, 2014, 12:46 p.m.
You mean magic property. And you mean wabbit. ;-D

Fedorovich on Dec. 3, 2014, 3:35 p.m.
There is a search in the comments, is not?

veky on Dec. 3, 2014, 3:57 p.m.
Not really. I'm pestering the admins for a long time about that. What are you intending to find?

Fedorovich on Dec. 4, 2014, 10:24 a.m.
:-) I just want to ask how your code works. Did it find here? <pre class='brush: python'>'''\ x | y | x∧y | x∨y | x→y | x⊕y | x≡y | -------------------------------------- 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | --------------------------------------''' </pre>

veky on Dec. 4, 2014, 10:35 a.m.
This is the data (kindly provided by the task text itself), and also the documentation (thereby the title). The code is below that (thereby the "up" in the title;). Code splits the docstring into first line (head, where labels of columns are written) and rest of lines (body), then searches through the body for a row that has the received x and y in the columns "x" and "y". Then it extracts a cell from that row corresponding to the column of the received operation's symbol. Exactly the same process a human would use to read that table. ;-) Anything else needs explaining?

Fedorovich on Dec. 4, 2014, 11:39 a.m.
I try to see. Thank you.

sirmax on Jan. 23, 2015, 2:14 p.m.
WOW! I just realized how you have done it. Cool. Thank you for lessons. I'm a newbie in python and your solutions is a very good demo to learn python language deeper.

veky on Jan. 24, 2015, 9:26 a.m.
That's exactly why I write them. ;-) BTW you think you got everything? Ok, then try to explain why I <pre class='brush: python'>zip(reversed(head), reversed(line)) </pre> instead of just <pre class='brush: python'>zip(head, line) </pre> to form my dict. ;-)

OMFGNuts on Jan. 26, 2015, 9:22 a.m.
Thank you once again for spending so much time on CheckiO. I mean we at CheckiO really do appreciate your work :)

veky on Jan. 26, 2015, 3:53 p.m.
No problem. I like being here. ;-)

jakubbortlik on Dec. 5, 2022, 9:05 a.m.
This is what caught my attention too, but then I realized that you need to reverse the the head and line in order to assign the correct values to `x` and `y` in the `row` dictinoary. If you used just `zip(head, line)` the values would be `' '` for both `x` and `y`. Thanks for the lesson!

jkibbe on March 10, 2015, 12:45 p.m.
Brilliant madness -- at least from what I can understand!

veky on March 11, 2015, 4:16 a.m.
Does <a href="http://www.checkio.org/mission/boolean-algebra/publications/veky/python-3/whats-up-__doc__/share/897af65c5de9dccfc5fecc26561b03f9/#comment-21450">this</a> help? :-) I do the same thing doctest does, just from a different direction. ;-) If this is madness, then doctests are too. :-P

mr.shrrgn on Jan. 31, 2016, 11:48 p.m.
Amazing. but i don't understand((

veky on Feb. 1, 2016, 12:01 a.m.
Not even reading <a href="http://www.checkio.org/mission/boolean-algebra/publications/veky/python-3/whats-up-__doc__/share/897af65c5de9dccfc5fecc26561b03f9/#comment-21450">this</a> helps? Can you be a bit more specific?

mr.shrrgn on Feb. 1, 2016, 12:12 a.m.
Why do you use operation in brackets?

veky on Feb. 1, 2016, 6:08 p.m.
Because I'm indexing a dict (specified on lines 10~16) by it. It's a simple switch statement. <pre class='brush: python'>dict(a=5, b=6, c=2) ['b'] == {'a':5, 'b':6, 'c':2} ['b'] == 6 </pre> Any more questions?

mr.shrrgn on Feb. 2, 2016, 10:10 p.m.
I think i get it. Thanks!

DahliaSR on Nov. 21, 2016, 7:54 p.m.
Cheater! The taks asked you to calculate the return value and not to look it up in a table. :D

veky on Nov. 21, 2016, 8:24 p.m.
Ah, who even reads the task text these days... 😜 More seriously, the line is blurry. For example, do you consider dimpleqonx to be calculation or lookup? 😜

dig on Feb. 24, 2023, 10:04 p.m.
OMG! just searching solutions with 'splitlines' and finding this!!

veky on Feb. 25, 2023, 9:56 p.m.
Yeah, that's quite an unusual way to find this. :-D

Look up in the Dict()

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