有没有更好的方式用Python编写这段代码？(将UCI-move转换为bitboard，国际象棋)

def uci_to_bitboard(uci_move):
    file_map = {'a': 0, 'b': 1, 'c': 2, 'd': 3, 'e': 4, 'f': 5, 'g': 6, 'h': 7}
    rank_map = {'1': 7, '2': 6, '3': 5, '4': 4, '5': 3, '6': 2, '7': 1, '8': 0}

    from_square = (file_map[uci_move[0]] << 3) | rank_map[uci_move[1]]
    to_square = (file_map[uci_move[2]] << 3) | rank_map[uci_move[3]]

    return (1 << from_square) | (1 << to_square)

# 示例用法
uci_move = 'e2e4'
bitboard = uci_to_bitboard(uci_move)
print(bitboard)