python多线程--threading简单实现
threading模块
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局域网IP扫描实例
# 单线程:
import subprocess,time,threading a = time.clock() with open("check_ping.txt",'w') as f: for i in range(1,20): my_ip = ".".join(["192.163.37",str(i)]) try: subprocess.check_call('ping -n 1 -w 1 %s'%(my_ip),shell=True) except subprocess.CalledProcessError: pass else: f.write("%s 可以ping通\n"%my_ip) b = time.clock() print(b) # 总共花费8s多
# 多线程(一)创建 Thread 的实例,传给它一个函数
a = time.clock() def check_ping(IP,obj): try: subprocess.check_call('ping -n 1 -w 1 %s' % IP, shell=True) except subprocess.CalledProcessError: pass else: obj.write("%s 可以ping通\n" % IP) def main(): threads = [] with open("check_ping_1.txt", 'w') as f: for i in range(1, 20): my_ip = ".".join(["192.163.37", str(i)]) t = threading.Thread(target=check_ping,args=(my_ip,f)) #Thread方法:实例化一个线程对象,把函数(target)和参数(args)传进去,然后返回Thread实例,这里并没有执行。 threads.append(t) num = range(len(threads)) for i in num: threads[i].start() #执行线程的start方法,线程开始执行 for i in num: threads[i].join() #这行线程的join方法,等待线程结束,如果主进程不需要等待线程结束,可以不需要调用join方法。 if __name__ == '__main__': main() b = time.clock() print(b) # 总共花费0.9s
# 多线程(二)创建 Thread 的实例,传给它一个可调用的类实例
a = time.clock() class Thread_func: def __init__(self,func,args): self.func = func self.args = args def __call__(self): #__call__方法:将类模拟成函数,实例化后的类再次实例化相当于执行了__call__方法。 self.func(*self.args) def check_ping(IP,obj): try: subprocess.check_call('ping -n 1 -w 1 %s' % IP, shell=True) except subprocess.CalledProcessError: pass else: obj.write("%s 可以ping通\n" % IP) def main(): threads = [] with open("check_ping_2.txt", 'w') as f: for i in range(1, 20): my_ip = ".".join(["192.163.37", str(i)]) t = threading.Thread(target=Thread_func(check_ping,(my_ip,f))) #Thread_func实例化时已经传入了参数,所以Thread方法中就不用args来传参了。 threads.append(t) num = range(len(threads)) for i in num: threads[i].start() for i in num: threads[i].join() if __name__ == '__main__': main() b = time.clock() print(b) # 总共花费1
# 多线程(三)派生 Thread 的子类,并创建子类的实例
a = time.clock() class Thread_func(threading.Thread): #继承Thread,调用更灵活。 def __init__(self,func,args): threading.Thread.__init__(self) self.func = func self.args = args def run(self): #这里必须使用run方法,当线程开启后执行。 self.func(*self.args) def check_ping(IP,obj): try: subprocess.check_call('ping -n 1 -w 1 %s' % IP, shell=True) except subprocess.CalledProcessError: pass else: obj.write("%s 可以ping通\n" % IP) def main(): threads = [] with open("check_ping_3.txt", 'w') as f: for i in range(1, 20): my_ip = ".".join(["192.163.37", str(i)]) t = Thread_func(check_ping,(my_ip,f)) threads.append(t) num = range(len(threads)) for i in num: threads[i].start() for i in num: threads[i].join() if __name__ == '__main__': main() b = time.clock() print(b) # 花费0.7
本文标题:python多线程--threading简单实现
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