第 8 天 多线程与多进程

1、输入数据截取指定字段

mandatory_fields = ["-p","-s"]
            for i  in mandatory_fields:
                if i not in self.args:
                    sys.exit("33[31;1mLack of argument [%s]33[0m" % i)
            try:
                self.ftp_host = self.args[self.args.index("-s") + 1]
                self.ftp_port = int(self.args[self.args.index("-p") + 1])
            except (IndexError,ValueError):
                self.help_msg()
                sys.exit()

 2.1、创建一个线程

#!/uer/bin/env python
# -*- coding:utf-8 -*-

import threading

class MyThread(threading.Thread):

    def __init__(self,name):
        super(MyThread,self).__init__()
        self.name = name

    def run(self):
        print("thread is running",self.name)
t = MyThread("jim")
t1 = MyThread("ALEX")
t.start() #开启一个线程
t1.start() #再开启一个线程

输出结果:

thread is running jim
thread is running ALEX

2.2、第二种方法

#!/uer/bin/env python
# -*- coding:utf-8 -*-

import threading
def pao(num):
        print("thread is runing",num)

t = threading.Thread(target=pao,args=(3,))
t1 = threading.Thread(target=pao,args=(4,))
t.start()
t1.start()

输出结果:

thread is runing 3
thread is runing 4

 线程的阻塞：

1. #!/usr/bin/env python
   # -*- coding:utf-8 -*-
   
   import threading
   import time
   
   def saihi(n):
       print("hello %s"% n)
       time.sleep(2)
   
   if __name__=="__main__":
       t_list=[]
       for i in range(10):
           n = threading.Thread(target=saihi ,args=[i,])
           n.start()
           t_list.append(n)
       for t in t_list:
           t.join() #阻塞所有的线程执行完毕之后，再打印"==main=="
   
       print("==main==")

 守护线程：

当守护线程结束后，被守护的线程也同时结束！

m = threading.Thread(target=my_main,args=[] )
m.start()
m.setDaemon() #设置为守护线程