Python 3.x 如何替换此列表中的“无”值？

我需要从这个2-D列表

替换空白空间或无值

chess_board = [ [rook_3, knight_3, bishop_3, queen_2, king_2, bishop_4, knight_4, rook_4],
                [pawn_9, pawn_10, pawn_11, pawn_12, pawn_13, pawn_14, pawn_15, pawn_16],
                [],
                [],
                [],
                [],
                [pawn_1, pawn_2, pawn_3, pawn_4, pawn_5, pawn_6, pawn_7, pawn_8],
                [rook_1, knight_1, bishop_1, queen_1, king_1, bishop_2, knight_2, rook_2]
               ]

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使用列表理解测试布尔上下文中的真实性：

[i for i in chess_board if i]

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你能详细说明一下你在找什么吗

>>> x = [[1, 2], [], [3, 4]]
>>> [i for i in x if i]
[[1, 2], [3, 4]]
>>>