crossword.py

grid = ['WBWBWBWBWBWBWBW', 'WWWWWWWBWWWWWWW', 'WBWBWBWBWBWBWBW', 'WWBWWWWWWWWWWWW', 'WBWBWBWBWBWBWBW', 'WWWWWWWBBWWWWWW', 'WBWBBBWBWBWBWBW',
 'BWWWWWWWWWWWWWB', 'WBWBWBWBWBBBWBW', 'WWWWWWBBWWWWWWW', 'WBWBWBWBWBWBBBW', 'WWWWWWWWWWWWWWW', 'WBWBWBWBWBWBWBW', 'WWWWWWWBWWWWWWW', 'WBWBWBWBWBWBWBW']
BLACK = 'B'
WHITE = 'W'
SEQUENCE = BLACK+WHITE+WHITE


def addBlacksAround(grid):
 width = len(grid[0])
 newGrid = [BLACK+row+BLACK for row in grid]
 newGrid.append((width+2)*BLACK)
 newGrid.insert(0, (width+2)*BLACK)
 return newGrid


def numberGrid(grid):
 positionsOfNumbers = []
 number = 1
 width = len(grid[0])

 def sequenceFound(row, col):
 return grid[row][col-1]+grid[row][col]+grid[row][col+1] == SEQUENCE or grid[row-1][col]+grid[row][col]+grid[row+1][col] == SEQUENCE

 for row in range(1, width-1):
 for col in range(1, width-1):
 if sequenceFound(row, col):
 positionsOfNumbers.append((row-1, col-1, number))
 number += 1
 return positionsOfNumbers


print(numberGrid(addBlacksAround(grid)))