my ttt solution

tictactoe.py

import numpy as np
def is_solved(board):
    
    grid = np.array(board)
    
    row0 = grid[0]
    row1 = grid[1]
    row2 = grid[2]
    col0 = grid[:, 0]
    col1 = grid[:, 1]
    col2 = grid[:, 2]
    diag0 = np.einsum('ii->i', grid)
    diag1 = np.einsum('ii->i', np.flip(grid))

    possibilities = [row0, row1, row2, col0, col1, col2, diag0, diag1]
    for vect in possibilities:
        if np.all(vect == vect[0]):
            return vect[0] if vect[0] else -1
    return 0 if np.all(grid) else -1