lambda clear solution for Moore Neighbourhood by Phil15 - python coding challenges

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lambda solution in Clear category for Moore Neighbourhood by Phil15

from itertools import product as prod
count_neighbours = lambda G,r,c: sum(G[r+i][c+j]
                                     for i,j in set(prod(*[(-1,0,1)]*2))-{(0,0)}
                                     if 0<=r+i
                        Oct. 10, 2018

                        
                            Comments:
                            
                                
                                    Stensen
 on Nov. 9, 2020, 6 p.m.

                                    <p>I really don't know what to say, but the least I can say is that is marvelous!</p>

                                
                            
                                
                                    Phil15
 on Nov. 9, 2020, 9:06 p.m.

                                    <p>I'm not sure why I put this in clear category, today I would put it in creative one. Or make it more readable:</p>

<pre class='brush: python'>from itertools import product

moves = set(product((-1, 0, 1), repeat=2)) - {(0, 0)}

def count_neighbours(grid, row, col):
    return sum(
        grid[row + dr][col + dc]
        for dr, dc in moves
        if 0 &lt;= row + dr &lt; len(grid) and 0 &lt;= col + dc &lt; len(grid[0])
    )
</pre>

                                
                            
                                
                                    Stensen
 on Nov. 9, 2020, 10:17 p.m.

                                    <p>Superb!</p>

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