如何从另一个类中的函数更改类变量

class ClassA:
    class_variable = 0  # 这是一个类变量

class ClassB:
    @staticmethod
    def change_variable(value):
        ClassA.class_variable = value  # 直接通过类名访问并修改类变量

# 使用示例
print("初始值:", ClassA.class_variable)
ClassB.change_variable(10)
print("更改后的值:", ClassA.class_variable)

import threading

class ClassA:
    class_variable = 0
    lock = threading.Lock()

class ClassB:
    @staticmethod
    def change_variable(value):
        with ClassA.lock:
            ClassA.class_variable = value

# 使用示例
print("初始值:", ClassA.class_variable)
threads = [threading.Thread(target=ClassB.change_variable, args=(i,)) for i in range(10)]
for thread in threads:
    thread.start()
for thread in threads:
    thread.join()
print("更改后的值:", ClassA.class_variable)