python的多线程

创建线程的两种方法
继承Thread类，并重写它的run()方法
import threading
import time
cLass MyThread(threading.Thread):
	def__ init__ (seLf, n):
		super (MyThread, seLf).__ init__()
		self.n = n
	def run(self):
		print('以类的方式创建多线程'，self.n)
		time.sleep(3)
r1 = MyThread(1)
r2 = MyThread(2)
r1.start()
r2.start()
调用threading库的Thread类
import threading
import time
def test(x):
    print(x)
    time.sleep(2)
if __name__=='__main__':
    t1 = threading.Thread(target=test, args=(1,))  
    t2 = threading.Thread(target=test, args=(2,))
    t1.start()
    t2.start()

#守护线程
import threading
import time
def run(n):
    print('task',n)
    time.sleep(1)
    print('3s')
    time.sleep(1)
    print('2s')
    time.sleep(1)
    print('1s')
if __name__ == '__main__': #主线程
    t=threading.Thread(target=run,args=('t1',))
    t.setDaemon(True) #设置子线程为守护线程，守护主线程。主线程结束，子线程也立马结束。必须在start() 方法调用之前设置
    t.start()
    print('end')

1.互斥锁

#互斥锁
import threading
def run():
    global x
    lock.acquire() #申请锁
    x+=1 
    lock.release() #释放锁
if __name__=='__main__':
    x=0
    res=[]
    lock=threading.Lock() #实例化线程锁
    for i in range(100): #100个线程
        t=threading.Thread(target=run) 
        t.start()
        res.append(t)
    for t in res:
        t.join()    
    print(x) 
2.递归锁

import threading
def func(lock):
    global gl_num
    lock.acquire()
    gl_num += 1
    time.sleep(1)
    print(gl_num)
    lock.release()
if __name__ == '__main__':
    gl_num = 0
    lock = threading.RLock()
    for i in range(10):
       t = threading.Thread(target=func,args=(lock,))
       t.start()

import threading
import time  #导入时间模块

#线程一：输出当前的年月日时分秒
class myThread1(threading.Thread):
    def run(self):
        while (True):
            print(time.asctime(time.localtime(time.time())))#输出实时时间
            time.sleep(1)
#线程二：name每2秒打印输出4次结束
class myThread2(threading.Thread):#继承threading.Thread
    def __init__(self,name):#继承父类的方法实现继承threading.Thread       
        super(myThread2, self).__init__()#super方法调用父类
        self.name=name #实例化对象属性    
    def run(self):#重写Thread类中的run方法
        for i in range(4):#for循环打印4次
            print(self.name)          
            time.sleep(2)#打印一次delay两秒
if __name__ == '__main__':
    #创建线程1和线程2并传入参数
    x1 = myThread1()
    x2 = myThread2("张三")
    #开启线程
    x1.start()
    x2.start()