在Python中初始化类变量的快速方法

class MyClass:
    class_variable = "I am a class variable"

# 访问类变量
print(MyClass.class_variable)  # 输出: I am a class variable

class MyClass:
    @classmethod
    def initialize_class_variables(cls):
        cls.class_variable = "Initialized by class method"

# 调用类方法进行初始化
MyClass.initialize_class_variables()
print(MyClass.class_variable)  # 输出: Initialized by class method

class MetaClass(type):
    def __init__(cls, name, bases, dct):
        super().__init__(name, bases, dct)
        cls.class_variable = "Initialized by MetaClass"

class MyClass(metaclass=MetaClass):
    pass

# 访问类变量
print(MyClass.class_variable)  # 输出: Initialized by MetaClass

class MyClass:
    class_variable = "Shared value"

    def __init__(self):
        self.instance_variable = "Instance-specific value"

    def modify_instance_variable(self):
        self.instance_variable = "Modified instance-specific value"

# 创建实例并修改实例变量
obj = MyClass()
obj.modify_instance_variable()
print(obj.instance_variable)  # 输出: Modified instance-specific value
print(MyClass.class_variable)  # 输出: Shared value (未被修改)