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例えば:
次の配列があるとします。
[1,2,3] [4,5,6] [7,8,9]
そして、この配列を生成したい:
[1,5,9] [1,6,8] [4,2,9] [4,8,3] [7,2,6] [7,5,3]
import itertools A=[[1,2,3], [4,5,6], [7,8,9]] for P in itertools.permutations(range(len(A))): print [A[p][i] for i,p in enumerate(P)]
版画:
[1, 5, 9] [1, 8, 6] [4, 2, 9] [4, 8, 3] [7, 2, 6] [7, 5, 3]
私はコードを書いていました: <?PHP $where='<something'; echo $where; ?> しかし、文字列 $where を '< something' ("<" の後にスペースを追加) に変更するまで何もエコーしません。なぜですか?
<?PHP $where='<something'; echo $where; ?>
<