将变量传递给python/pyqt中的类的正确方式是什么？

class MyClass:
    def __init__(self, my_variable):
        self.my_variable = my_variable

# 实例化类并传递变量
my_instance = MyClass("Hello")

class MyClass:
    def __init__(self):
        self.my_variable = None

    def set_variable(self, value):
        self.my_variable = value

    def print_variable(self):
        print(self.my_variable)

# 实例化类并传递变量
my_instance = MyClass()

# 设置变量的值
my_instance.set_variable("Hello")

# 打印变量的值
my_instance.print_variable()