python之通过thread来实现多进程

代码如下：

import threading, time

class Test1(threading.Thread):
  def __init__(self, name):
    super().__init__(name=name)

  def run(self):
    print('test1 start')
    time.sleep(2)
    print('test1 end')

class Test2(threading.Thread):
  def __init__(self, name):
    super().__init__(name=name)

  # 继承thread必须覆盖的方法
  def run(self):
    print('test2 start')
    time.sleep(4)
    print('test2 end')

if __name__ == '__main__':
  thread1 = Test1('test1')
  thread2 = Test2('test2')
  start_time = time.time()
  thread1.start()
  thread2.start()

  # 使用join方法，这两个线程就会阻塞主线程的运行，print('main')就会后执行
  thread1.join()
  thread2.join()
  print('main')

结果：