python 创建并开启进程的两种方法

#方法一 直接调用
import time
import random
from multiprocessing import Process
def run(name):print('%s runing' %name)time.sleep(random.randrange(1,5))#进程挂起print('%s running end' %name)if __name__ == '__main__':p1=Process(target=run,args=('进程1',)) #必须加,号p2=Process(target=run,args=('进程2',))p3=Process(target=run,args=('进程3',))p4=Process(target=run,args=('进程4',))p1.start()#进程开始p2.start()p3.start()p4.start()print('主线程')

#方法二 继承式调用
import time
import random
from multiprocessing import Processclass Run(Process):def __init__(self,name):super().__init__()self.name=namedef run(self):print('%s runing' %self.name)time.sleep(random.randrange(1,5))print('%s runing end' %self.name)
if __name__ == '__main__':p1=Run('进程1')p2=Run('进程2')p3=Run('进程3')p4=Run('进程4')p1.start() #start会自动调用runp2.start()p3.start()p4.start()print('主线程')