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whileとglobalsと短絡評価でPythonチューリング完全ワンライナーは簡単

Last updated at Posted at 2018-12-12

lambdaでPythonチューリング完全ワンライナーくらいは簡単なのはわかったので、lambda抜きでもいけるかなと思ったら行けた。

コード例

内容は上記記事と同じ。一対一対応ができるので、さっきのがチューリング完全ならこっちもチューリング完全。

while not (globals().update({'ln':0, 'ns':{}}) if 'ln' not in globals() else None) and not (
	(ln == 0 and (print(1) or globals().update({'ln':1}))) or
	(ln == 1 and (print(3) or globals().update({'ln':2}))) or
	(ln == 2 and (ns.update({'i':20}) or globals().update({'ln':3}))) or
	(ln == 3 and (globals().update({'ln':4}) if ns['i'] else globals().update({'ln':7}))) or
	(ln == 4 and (print(ns['i']) or globals().update({'ln':5}))) or
	(ln == 5 and (ns.update({'i':ns['i']-1}) or globals().update({'ln':6}))) or
	(ln == 6 and (globals().update({'ln':3}))) or
	(ln == 7 and True) or
	0):pass

例のごとく、改行抜きでも動きます。

現在の課題は、ワンライナーで変数を定義することができず、globals().updateを多用していることかな。

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