用python编写一个歌手类，要求：1.具有姓名、性别和代表作等私有数据成员。2.具有增加、删除代表作等公有方法。3.具有外部属性，用来读写姓名和性别。4.具有外部属性，用来返回代表作

好的，以下是一个完整的用Python编写的歌手类示例，满足您的要求：

class Singer:
    def __init__(self, name, gender, masterpieces=None):
        self.__name = name
        self.__gender = gender
        self.__masterpieces = [] if masterpieces is None else masterpieces

    @property
    def name(self):
        return self.__name

    @name.setter
    def name(self, new_name):
        self.__name = new_name

    @property
    def gender(self):
        return self.__gender

    @gender.setter
    def gender(self, new_gender):
        self.__gender = new_gender

    @property
    def masterpieces(self):
        return self.__masterpieces

    def add_masterpiece(self, new_masterpiece):
        self.__masterpieces.append(new_masterpiece)

    def delete_masterpiece(self, masterpiece):
        if masterpiece in self.__masterpieces:
            self.__masterpieces.remove(masterpiece)

这个歌手类包含了姓名、性别和代表作等私有数据成员，并且具有增加、删除代表作等公有方法。外部属性用来读写姓名和性别，外部属性用来返回代表作。

您可以使用以下代码来创建一个Singer对象并测试它：

# 创建一个Singer对象，并打印它的姓名、性别和代表作
singer = Singer("Taylor Swift", "Female", ["Love Story", "Blank Space"])
print("Singer name:", singer.name)
print("Singer gender:", singer.gender)
print("Singer masterpieces:", singer.masterpieces)

# 修改Singer对象的姓名和性别，并打印修改后的结果
singer.name = "Adele"
singer.gender = "Female"
print("Singer name after modification:", singer.name)
print("Singer gender after modification:", singer.gender)

# 增加和删除Singer对象的代表作，并打印修改后的结果
singer.add_masterpiece("Hello")
singer.delete_masterpiece("Blank Space")
print("Singer masterpieces after modification:", singer.masterpieces)

输出结果如下：

Singer name: Taylor Swift
Singer gender: Female
Singer masterpieces: ['Love Story', 'Blank Space']
Singer name after modification: Adele
Singer gender after modification: Female
Singer masterpieces after modification: ['Love Story', 'Hello']