如何将新变量添加到对象中以在类中使用

class MyClass:
    def __init__(self, var1, var2):
        self.var1 = var1
        self.var2 = var2
        self.new_var = None  # 添加新变量并初始化为None

    def set_new_var(self, new_var):
        self.new_var = new_var

    def get_new_var(self):
        return self.new_var

class MyClass:
    def __init__(self, var1, var2):
        self.var1 = var1
        self.var2 = var2
        self.new_var = None  # 添加新变量并初始化为None

    def add_new_var(self):
        new_var = "New Variable"
        self.new_var = new_var

class MyClass:
    def __init__(self, var1, var2):
        self.var1 = var1
        self.var2 = var2
        self.new_var = None  # 添加新变量并初始化为None

    def set_new_var(self, new_var):
        self.new_var = new_var

    def get_new_var(self):
        return self.new_var

    def print_new_var(self):
        print(self.new_var)