在并行处理中，由于多个任务同时运行，无法保证方法的执行顺序。但是，如果需要按照一定的顺序调用方法来确保程序正确性，可以使用多线程的join方法来实现。

示例代码：

import threading

class CustomThread(threading.Thread): def init(self, name, previous_thread=None): super(CustomThread, self).init() self.name = name self.previous_thread = previous_thread

def run(self):
    if self.previous_thread:
        self.previous_thread.join()
    print(f'Thread {self.name} is running!')

创建三个线程

thread1 = CustomThread("1") thread2 = CustomThread("2", previous_thread=thread1) thread3 = CustomThread("3", previous_thread=thread2)

启动三个线程

thread1.start() thread2.start() thread3.start()

等待三个线程完成

thread1.join() thread2.join() thread3.join()

输出结果：

Thread 1 is running! Thread 2 is running! Thread 3 is running!