小明编写一个类实现设置马的品种、年龄、性别及速度，输出相应的

小明编写一个类实现设置马的品种、年龄、性别及速度，输出相应的语句，请补全代码。如下代码输出结果为“一匹阿拉伯12岁的公马，在草原上奔跑的速度为50km/h”。class ① : def init(self, category, gender, age): self.category = category ② self.age = age self.speed = 0 def get_descriptive(self): self.info = "一匹" + self.category + ③ + "岁的" +self.gender + "马" def write_speed(self, new_speed): self.speed = new_speed addr = "在草原上奔跑的速度为" print( ④ + "，" + addr + str(self.speed) + "km/h。")horse = Horse("阿拉伯","公",12)horse.get_descriptive()horse.write_speed(50)