关于棋盘的一个

def check_color(coords: str) -> bool:    if not re.search('^[a-h][1-8]$', coords):        raise valueerror('not a valid chess coordinate!')    if coords[0] in ('a', 'c', 'e', 'g') and int(coords[1]) % 2 == 0:        return true    if coords[0] in ('b', 'd', 'f', 'h') and int(coords[1]) % 2 == 1:        return true    return false

$ ./ch-1.py d3true$ ./ch-1.py g5false$ ./ch-1.py e6true

def knights_move(start_coord: str, end_coord: str) -> int:    for coord in (start_coord, end_coord):        if not re.search('^[a-h][1-8]$', coord):            raise valueerror(                f'the position {coord} is not a valid chess coordinate!')    deltas = ([2, 1], [2, -1], [-2, 1], [-2, -1],              [1, 2], [1, -2], [-1, 2], [-1, -2])    coords = [convert_coord_to_list(start_coord)]    target = convert_coord_to_list(end_coord)    moves = 1    seen = []

    while true:        new_coords = []        for coord in coords:            for delta in deltas:                new_pos = (coord[0] + delta[0], coord[1] + delta[1])                if not 0 < new_pos[0] < 9 or not 0 < new_pos[1] < 9 or new_pos in seen:                    continue                if new_pos == target:                    return moves                new_coords.append(new_pos)                seen.append(new_pos)        coords = new_coords        moves += 1

$ ./ch-2.py g2 a84$ ./ch-2.py g2 h23