python开发进程：进程开启方式&多进程

一，进程的开启方式

利用模块开启进程

 from multiprocessing import Process
 import time,random
 import os
 def piao(name):
     print(os.getppid(),os.getpid())
     print('%s is piaoing' %name)
     # time.sleep(random.randint(1,3))
     print('%s is piao end' %name)
 if __name__ == '__main__':
     p1=Process(target=piao,kwargs={'name':'alex',})
     p2=Process(target=piao,args=('wupeiqi',))
     p3=Process(target=piao,kwargs={'name':'yuanhao',})
     p1.start()
     p2.start()
     p3.start()
     print('主进程',os.getpid())

利用类开启进程

 from multiprocessing import Process
 import time,random
 import os
 class Piao(Process):
     def __init__(self,name):
         super().__init__()
         self.name=name
     def run(self):
         print(os.getppid(),os.getpid())
         print('%s is piaoing' %self.name)
         # time.sleep(random.randint(1,3))
         print('%s is piao end' %self.name)
 if __name__ == '__main__':
     p1=Piao('alex')
     p2=Piao('wupeiqi')
     p3=Piao('yuanhao')

     p1.start()
     p2.start()
     p3.start()
     print('主进程',os.getpid(),os.getppid())

二，多进程

服务器端

 from socket import *
 from multiprocessing import Process
 s=socket(AF_INET,SOCK_STREAM)
 s.setsockopt(SOL_SOCKET,SO_REUSEADDR,1) #就是它，在bind前加
 s.bind(('127.0.0.1',8088))
 s.listen(5)
 def talk(conn,addr):
     while True: #通信循环
         try:
             data=conn.recv(1024)
             if not data:break
             conn.send(data.upper())
         except Exception:
             break
     conn.close()
 if __name__ == '__main__':
     while True:#链接循环
         conn,addr=s.accept()
         p=Process(target=talk,args=(conn,addr))
         p.start()
     s.close()

客户端

 from socket import *
 c=socket(AF_INET,SOCK_STREAM)
 c.connect(('127.0.0.1',8088))

 while True:
     msg=input('>>: ').strip()
     if not msg:continue
     c.send(msg.encode('utf-8'))
     data=c.recv(1024)
     print(data.decode('utf-8'))
 c.close()