複素数を用いたジャンケン実装 - Qiita

import cmath _2pi = 2 * cmath.pi ROCK = 1 SCISSORS = complex(cmath.cos(_2pi/3), cmath.sin(_2pi/3)) PAPER = complex(cmath.cos(-_2pi/3), cmath.sin(-_2pi/3)) def judge(one, another): arg = cmath.phase(another / one) if arg == 0: return "あいこ" elif arg > 0: return "勝ち" else: return "負け" def test(): assert "勝ち" == judge(ROCK, SCISSORS) assert "勝ち" == judge(SCISSORS, PAPER) assert "勝ち" == judge(PAPER, RO