lines generator clear solution for Xs and Os Referee by Phil15 - python coding challenges

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lines generator solution in Clear category for Xs and Os Referee by Phil15

def lines(grid):
    # rows
    yield from grid
    # columns
    yield from zip(*grid)
    # diagonals
    yield grid[0][0], grid[1][1], grid[2][2]
    yield grid[0][2], grid[1][1], grid[2][0]

def checkio(game_result):
    return next((a for a, b, c in lines(game_result) if a == b == c != '.'), 'D')
    # Which is equivalent to:
    # for a, b, c in lines(game_result):
    #     if a == b == c != '.':
    #         return a
    # return 'D'

Feb. 27, 2020

Comments:

Ulukai85 on Oct. 8, 2020, 4:22 p.m.
Very nice solution, I had no idea of that use for 'from' with yield. I also really like your commentary at the end, which really helps to understand it. I had to scratch my head a bit to understand the last return statement, with the 'next', but I think now I got it ;).

iskenderunbtr on Nov. 3, 2020, 4:55 p.m.
I couldn't think it could be that way. a different solution, thank you

kdim on Jan. 24, 2021, 6:04 p.m.
interesting solution, and not quite standard

CDG.Axel on Oct. 3, 2021, 2:57 p.m.
good using of next for first element find!

thz on Dec. 23, 2021, 8:28 p.m.
Interesting solution using functions 'builtin.next' and 'yield'.

thz on Dec. 23, 2021, 8:33 p.m.
def lines(grid): # rows yield from grid # columns yield from zip(*grid) # diagonals yield grid[0][0], grid[1][1], grid[2][2] yield grid[0][2], grid[1][1], grid[2][0] def checkio(gameresult): return next((a for a, b, c in lines(gameresult) if a == b == c != '.'), 'D') # Which is equivalent to: # for a, b, c in lines(game_result): # if a == b == c != '.': # return a # return 'D'

trouble6174 on March 4, 2022, 6:49 a.m.
clear and clever, learned a lot from this solution, thank you

Guest_5a80b5eb on March 23, 2022, 9:46 p.m.
what is the advantage to crushing the for loop into one line? timeit shows that the 1-line version is more than twice as slow as the 4-line version

Phil15 on March 24, 2022, 7:46 a.m.
It's mostly for educational purpose.

Pactp on Oct. 23, 2023, 2:58 p.m.
Nice short solution. Tricky usage of "next"!

Phil15 on Oct. 23, 2023, 5:22 p.m.
Tricky because there are two arguments?

List, list and list again

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