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Pythonで九九を出力するワンライナー

Posted at

ワンライナー

$ python -c "print '\n'.join([''.join(['%3d'%(i*j) for i in range(1,10)]) for j in range(1,10)])"

(自分のための) 解説

$ python -c "" はコマンドラインから直接pythonのプログラムを実行するためのお作法

[]のところはPythonでいう内包表記。ループを簡単に書けるっぽい。 print[i*j for i in range(1,10) for j in range(1,10)] を実行すると、

[1, 2, 3, 4, 5, 6, 7, 8, 9, 2, 4, 6, 8, 10, 12, 14, 16, 18, 3, 6, 9, ...中略...36, 45, 54, 63, 72, 81]

と九九の計算結果が丸々表示される。

コレを適宜改行させるために、まず join関数で計算結果を一段毎に一つの文字列にしてしまう

print [''.join(['%3d'%(i*j) for i in range(1,10)]) for j in range(1,10)]

['  1  2  3  4  5  6  7  8  9', '  2  4  6  8 10 12 14 16 18', '  3  6  9 12 15 18 21 24 27', '  4  8 12 16 20 24 28 32 36', '  5 10 15 20 25 30 35 40 45', '  6 12 18 24 30 36 42 48 54', '  7 14 21 28 35 42 49 56 63', '  8 16 24 32 40 48 56 64 72', '  9 18 27 36 45 54 63 72 81']

あとはこれを一段ごとに改行するためにさらにjoin関数で挟むと出来上がり。

print '\n'.join([''.join(['%3d'%(i*j) for i in range(1,10)]) for j in range(1,10)])

出力結果

  1  2  3  4  5  6  7  8  9
  2  4  6  8 10 12 14 16 18
  3  6  9 12 15 18 21 24 27
  4  8 12 16 20 24 28 32 36
  5 10 15 20 25 30 35 40 45
  6 12 18 24 30 36 42 48 54
  7 14 21 28 35 42 49 56 63
  8 16 24 32 40 48 56 64 72
  9 18 27 36 45 54 63 72 81
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