from band_members.musician import Musician


class Singer(Musician):
    def __init__(self, name: str, age: int):
        super().__init__(name, age)

    def learn_new_skill(self, new_skill):
        skill_list = ["sing high pitch notes", "sing low pitch notes"]
        if new_skill not in skill_list:
            raise ValueError(f"{new_skill} is not a needed skill!")
        if new_skill in self.skills:
            raise Exception(f"{new_skill} is already learned!")
        self.skills.append(new_skill)
        return f"{self.name} learned to {new_skill}."