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特定配列内の長さの不定な配列同士の直積を得る。

Posted at

上手いタイトルが付けられなかったのですが、やりたいことは単純です。

やりたいこと

長さが違う長さが違う配列の配列の直積を得たい!

A = [[1,2],[3,4]]
f(A)

↑これの出力がこれ↓

(1, 3)
(1, 4)
(2, 3)
(2, 4)
B = [[1],[2,3],[4,5,6]]
f(B)

↑これの出力がこれ↓

(1, 2, 4)
(1, 2, 5)
(1, 2, 6)
(1, 3, 4)
(1, 3, 5)
(1, 3, 6)

unpack!

*をつけると配列とか辞書をほぐせるらしい。

A = [1,2]
print(*A) #1 2 

つまり!こんなふうに書けばいい↓

import itertools

def f(X):
    for x in itertools.product(*X):
        print(x)

A = [[1,2],[3,4]]
B = [[1],[2,3],[4,5,6]]

f(A)
f(B)

これでいい!

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