Xs and Os Referee Xs and Os Referee
Simple
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Tic-Tac-Toe, sometimes also known as Xs and Os, is a game for two players (X and O) who take turns marking the spaces in a 3×3 grid. The player who succeeds in placing three respective marks in a horizontal, vertical, or diagonal rows (NW-SE and NE-SW) wins the game.

But we will not be playing this game. You will...

x-o-referee

A game's result is presented as a list of strings, where "X" and "O" are players' marks and "." is the empty cell.

A game result as a list of strings (unicode).

"X", "O" or "D" as a string.

checkio([
    "X.O",
    "XX.",
    "XOO"]) == "X"
checkio([
    "OO.",
    "XOX",
    "XOX"]) == "O"
checkio([
    "OOX",
    "XXO",
    "OXX"]) == "D"

The concepts in this task will help you when iterating data types. They can also be used in game algorithms, allowing you to know how to check results.


There is either one winner or a draw.
len(game_result) == 3
all(len(row) == 3 for row in game_result)

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