Python Basics: Day10

One, Python concurrent programming Multi-Threading 1.1 threading Module

How to use from threading import Thread

#!/usr/bin/python#-*-coding:utf-8-*-from Threading Import threadfrom multiprocessing import  processdef work (name ):    print ('%s say hello '%name) if __name__ = = ' __main__ ':    t=thread (' Egon ',)    # target=work,args= (target=work,args= (' Egon ',))    T.start ()    print (' main thread ')

1.2 Two ways to open threads (same process)

#方式一from Threading Import Threadimport timedef Sayhi (name):    time.sleep (2)    print ('%s say hello '%name) if __name_ _ = = ' __main__ ':    t=thread (target=sayhi,args= (' Egon '))    T.start ()    print (' main thread ') #方式二from threading Import Threadimport timeclass Sayhi (Thread):    def __init__ (self,name):        super (). __init__ ()        self.name=name    def run (self):        time.sleep (2)        print ('%s say hello '% self.name) if __name__ = = ' __main__ ':    t = sayhi (' Egon ')    T.start ()    print (' main thread ')

1.3 Multi-process and multi-threaded differences

#!/usr/bin/python#-*-coding:utf-8-*-from Threading Import threadfrom multiprocessing import processimport osdef work () :    print (' hello ') if __name__ = = ' __main__ ':    #在主进程下开启线程    t=thread (target=work)    T.start ()    Print (' main thread/main process ')

Multithreaded concurrent sockets

#!/usr/bin/python#-*-coding:utf-8-*-from socket Import *from Threading Import Threaddef Server (ip,port):    S.bind (( Ip,port))    S.listen (5)    while True:        conn, addr = s.accept ()        print (' client ', addr)        t = Thread (target =talk, args= (conn, addr))        T.start () def talk (CONN,ADDR): #通信    try: While        True:            res=conn.recv (1024)            if not res:break            print (' Client%s:%s msg:%s '% (addr[0],addr[1],res))            Conn.send (Res.upper ())    Except Exception:        pass    finally:        conn.close () if __name__ = = ' __main__ ':    server (' 127.0.0.1 ', 8080 )

Client

#_ *_coding:utf-8_*_#!/usr/bin/env pythonimport sockets=socket.socket (socket.af_inet,socket. Sock_stream) S.connect ((' 127.0.0.1 ', 8080)) while True:    msg=input (' >>: '). Strip ()    if not msg:continue    s.send (Msg.encode (' Utf-8 '))    data=s.recv (1024x768)    print (data)

Multi-threaded text Save input content

#!/usr/bin/python#-*-coding:utf-8-*-from Threading import Threadmsg_l=[]format_l=[]def Talk (): While    True:        Msg=input (' >>: '). Strip ()        if not msg:continue        msg_l.append (MSG) def format (): While    True:        If msg_l:            res=msg_l.pop ()            res=res.upper ()            Format_l.append (RES) def save (): While    True:        if format _l:            res=format_l.pop ()            with open (' Db.txt ', ' a ', encoding= ' utf-8 ') as F:                f.write ('%s\n '%res) if __name_ _ = = ' __main__ ':    t1=thread (Target=talk)    t2=thread (Target=format)    t3=thread (target=save)    T1.start ()    T2.start ()    T3.start ()

1.4 Threading Methods

Methods for thread instance objects
  # isAlive (): Returns whether the thread is active.  # getName (): Returns the thread name.  # SetName (): Sets the thread name. Some of the methods provided by the threading module are:  # threading.currentthread (): Returns the current thread variable.  # threading.enumerate (): Returns a list that contains the running thread. Running refers to threads that do not include pre-and post-termination threads until after the thread has started and ends.  # Threading.activecount (): Returns the number of running threads with the same result as Len (Threading.enumerate ()).

#!/usr/bin/python#-*-coding:utf-8-*-n=11111111111111111111111111111111111import timefrom Threading Import Threadimport threadingdef work ():    time.sleep (2)    print ('%s say hello '% (Threading.current_thread (). GetName () ) If __name__ = = ' __main__ ':    t=thread (target=work)    # T.setdaemon (True) #设置守护线程随主线程关闭    t.start ()    T.join ()    print (Threading.enumerate ()) #当前活跃的线程对象, is a list form    print (Threading.active_count ()) #当前活跃的线程数目    print (' main thread ', Threading.current_thread (). GetName ())

　　

　　

　　

　

　　

Python Basics: Day10