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+ def first_feature ():
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+ """
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+ 选择特征确定动物类别
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+ :return: 动物类别: int
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+ """
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+ print ('1恒温且有脊椎;2有羽毛且卵生;3有鳞片/角质层且三心室' )
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+ choice = input ('请选择特征' )
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+ return int (choice )
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+
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+ def specific_feature (choice ):
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+ """
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+ 输入动物类别,再选择动物特征,确定具体动物类别
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+ :param choice: int
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+ :return: 具体动物: str
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+ """
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+ if choice == 1 :
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+ mammal ()
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+ elif choice == 2 :
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+ bird ()
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+ elif choice == 3 :
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+ reptile ()
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+ else :
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+ print ('输入无效,无法确定动物类别' )
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+
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+ def mammal ():
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+ """
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+ 确定是哺乳动物,继续选择特征,确定具体动物
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+ :return: 无
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+ """
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+ print ('该动物是哺乳动物' )
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+ print ()
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+ print ('1能捕鼠;2有黑色斑点;3生活在海洋' )
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+ choice = int (input ('请继续从上面特征中进行选择' ))
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+ if choice == 1 :
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+ print ('该动物是猫' )
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+ elif choice == 2 :
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+ print ('该动物是豹' )
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+ elif choice == 3 :
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+ print ('该动物是鲸' )
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+ else :
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+ print ('输入无效,无法确定具体动物' )
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+
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+ def bird ():
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+ """
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+ 确定是鸟类,继续选择特征,确定具体动物
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+ :return: 无
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+ """
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+ print ('该动物是鸟类动物' )
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+ print ()
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+ print ('1羽毛艳丽;2雌雄成对;3乌黑羽毛' )
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+ choice = int (input ('请继续从上面特征中进行选择' ))
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+ if choice == 1 :
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+ print ('该动物是孔雀' )
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+ elif choice == 2 :
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+ print ('该动物是鸳鸯' )
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+ elif choice == 3 :
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+ print ('该动物是乌鸦' )
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+ else :
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+ print ('输入无效,无法确定具体动物' )
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+
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+ def reptile ():
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+ """
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+ 确定是爬行动物,继续选择特征,确定具体动物
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+ :return: 无
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+ """
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+ print ('该动物是爬行动物' )
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+ print ()
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+ print ('1无四肢;2体背腹扁平;3有甲壳' )
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+ choice = int (input ('请继续从上面特征中进行选择' ))
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+ if choice == 1 :
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+ print ('该动物是蛇' )
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+ elif choice == 2 :
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+ print ('该动物是壁虎' )
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+ elif choice == 3 :
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+ print ('该动物是乌龟' )
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+ else :
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+ print ('输入无效,无法确定具体动物' )
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+
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+ if __name__ == '__main__' :
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+ choice = first_feature ()
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+ specific_feature (choice )
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