First clear solution for Moore Neighbourhood by gyahun_dash - python coding challenges

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First solution in Clear category for Moore Neighbourhood by gyahun_dash

def count_neighbours(grid, row, col):
    rows = range(max(0, row - 1), min(row + 2, len(grid)))
    cols = range(max(0, col - 1), min(col + 2, len(grid[0])))

    return sum(grid[r][c] for r in rows for c in cols) - grid[row][col]

Sept. 30, 2014

Comments:

Sim0000 on Sept. 30, 2014, 5:45 p.m.
Clear solution!

gyahun_dash on Oct. 1, 2014, 4:14 p.m.
(cont) I consulted yours to make mine clear. Thanks again.

gyahun_dash on Oct. 1, 2014, 11:03 a.m.
Thank you! When publishing this, somehow it reminded me of <a href="http://www.checkio.org/mission/weak-point/publications/Sim0000/python-3/first/">your solution</a>.

artemrudenko on Oct. 2, 2014, 5:39 a.m.
Cool, but for me it was simplier to specify directions mapp

gyahun_dash on Oct. 4, 2014, 3:46 a.m.
I like either(also yours), but I just want to write built-in functions rather than many constants.

Blukano on Oct. 2, 2014, 9:42 p.m.
Nice! I'm a beginner with Python, and needed 20 lines of code to solve this problem. Makes me realise how much I need to learn.

LostxinthexMusic on Oct. 15, 2014, 11:09 p.m.
Keep in mind that more lines does not always mean worse code! You can make your code make sense to a human without having any effect on how a computer processes it. Spend your time making your code efficient, not short.

gyahun_dash on Oct. 4, 2014, 4:04 a.m.
Thank you.　Python has very useful functions and notations(for example, list comprehension and generator expression). They can make you more fun!

veky on Oct. 4, 2014, 8:13 a.m.
Slicing is better than indexing by range. And you don't need those mins then.

gyahun_dash on Oct. 4, 2014, 11 a.m.
Thank you, I didn't think of that. So I tried to use slices (<a href="http://www.checkio.org/mission/count-neighbours/publications/gyahun_dash/python-3/slice/">here</a>).

mikewr80 on Oct. 16, 2014, 10:52 a.m.
Really nice solution!Thumbs !

gyahun_dash on Oct. 24, 2014, 3:27 p.m.
Thank you!

serhiideliiev on Nov. 9, 2014, 11:59 p.m.
Really a clear solution and wise approach!

gyahun_dash on Nov. 13, 2014, 3:41 p.m.
Thank you!

RubenDjon on Nov. 13, 2014, 10:50 p.m.
OMG, how much I need to learn about python. Great solution.

gyahun_dash on Nov. 23, 2014, 7:33 a.m.
Thank you. Enjoy it!

pensis on Dec. 14, 2014, 4:51 a.m.
As a beginner I used a nested for loop and didn't know this use of "sum()". Thanks for your solution.

gyahun_dash on Dec. 15, 2014, 12:31 p.m.
You are welcome.

IvanKoval on Dec. 20, 2014, 3:12 a.m.
this solution match better than mine

gyahun_dash on Jan. 3, 2015, 5:58 p.m.
Thank you.

or_halimi on Jan. 15, 2015, 6:58 p.m.
Its not suppose to be range(max(0, row - 1), min(row + 2, len(grid - 1))) ?

shavy69 on Feb. 13, 2015, 7:13 a.m.
Short and Simple I like it. thumb up What if chips are represented with diffenent number or letter. The solution would fail.

MarcinSzpakiewicz on Feb. 14, 2015, 5:36 p.m.
This is the best lesson for me to use the range() function. Many thanks

giolefpaceid on Feb. 21, 2015, 12:07 p.m.
Nice solution!

chhyx2008 on March 3, 2015, 8:51 a.m.
Clear to understand.

bruce20036 on April 7, 2015, 6:04 p.m.
Can any one explain the code? please,

bryukh on April 11, 2015, 5:48 a.m.
The author choose near rows and columns <pre class='brush: python'>range(max(0, row - 1), min(row + 2, len(grid))) </pre> For common cases it gives range(row - 1, row + 2). For example for row=3 => 2,3,4. For edge cases it takes 0 and len(grid). Then the last line counts all element in that borders.

kryksyh on April 8, 2015, 8:09 p.m.
Very nice! How did I not came up with min and max.. :)

gmixo on April 21, 2015, 3:26 a.m.
hmm looks like my solution too)

tommycarstensen on April 23, 2015, 9:36 p.m.
Beautiful and clear!

aaaaxiaofei on April 27, 2015, 12:47 a.m.
A good way to use max and min instead of "for"!

Mithrandir on May 6, 2015, 1:13 p.m.
Readable and concise solution. And again great idea to just sum up 1.

VaibhavPython on July 16, 2015, 11:42 a.m.
Very clear indeed

apotokin on July 25, 2015, 10:14 a.m.
ce parfait! )

wernkebr on Aug. 3, 2015, 10:44 p.m.
Brilliant!

ThirdHeat on Aug. 13, 2015, 3:56 a.m.
I love this. So concise. I still have a way to go with my Python skills.

Kapsiaoloong on Aug. 15, 2015, 3:52 a.m.
Amazing

intspt on Aug. 19, 2015, 2:21 a.m.
what is the difference between <pre class='brush: python'>sum(grid[r][c] for r in rows for c in cols) </pre> and <pre class='brush: python'>sum([grid[r][c] for r in rows for c in cols]) </pre>

regan.ryan.nz on Aug. 27, 2015, 8:29 a.m.
It took me ~12 lines to do what you did in 3...

leusgalvan on Sept. 23, 2015, 10:37 p.m.
That max/min trick works like a charm ;)

Fingol on Oct. 21, 2015, 1:46 p.m.
Best!

d.guyvan on Oct. 24, 2015, 11:22 a.m.
cool

dhs789520 on Nov. 29, 2015, 4:15 p.m.
thumbUp

swj on Dec. 30, 2015, 3:34 p.m.
牛逼

suiluj_julius on Jan. 7, 2016, 3:34 p.m.
Great and smart solution! Thanks for the share!

Cordivae on Jan. 10, 2016, 2:42 p.m.
Very elegant

chigiwar on Feb. 16, 2016, 10:50 a.m.
Geniusly!

hoanghuy0910 on April 21, 2016, 5:18 p.m.
very simple and effective

onev on April 24, 2016, 3:58 p.m.
it's very cool!!! thumbUP!

penn201500 on May 28, 2016, 7:02 a.m.
wow, no need to search all positions, process the corner and border so clever!

pinto.faa on June 20, 2016, 6 a.m.
Could you explain what did you think while writing those ranges, please?

walkerh on Aug. 28, 2016, 4:22 p.m.
Very good.

PythonWithPI on Feb. 9, 2019, 1:36 p.m.
Wow! I never thought to use max to keep the search on the board. I like this more than how I usually do it, with a relative neighbors tuple, a move function that adds the relative neighbor to the cell's coordinates, and a check to see if the 'moved' cell is on the board. This is definitely faster too. I also like the subtraction of the middle cell and the ranges instead of making a tuple out of the neighbors.

zeixes on Oct. 20, 2023, 1:02 p.m.
Elegant solution.Nice.

igharok on Sept. 17, 2024, 2:14 p.m.
Elegance

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