6-1.py

grid = [[False for x in range(1000)] for y in range(1000)]
with open('day6.txt', 'r') as f:
    for line in f.readlines():
        instructions = line.split()
        x1, y1 = (int(i) for i in instructions[-3].split(','))
        x2, y2 = (int(i) for i in instructions[-1].split(','))

        for x, row in enumerate(grid):
            for y, col in enumerate(row):
                if x1 <= x <= x2 and y1 <= y <= y2:
                    if instructions[0] == 'toggle':
                        # toggle
                        grid[x][y] = not grid[x][y]
                    elif instructions[1] == 'on':
                        # turn on
                        grid[x][y] = True
                            
                    else:
                        # turn off
                        grid[x][y] = False

print sum(row.count(True) for row in grid)