如題！！！！！！！！！！！！！
uj5u.com熱心網友回復：
[[None, None, None, None, None], [None, None, None, None, None], [None, None, None, None, None], [None, None, None, None, None], [None, None, None, None, None]]如果n=5,就是一個5*5內容為none的串列
uj5u.com熱心網友回復：
這個代碼意思就相當于：board=[]
for i in range(n):
list_1=[]
for j in range(n):
list_1.append(None)
board.append(list_1)
只不過這樣可以簡化代碼
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