python多线程

    1）可以使用  concurrent.futures 包里的ThreadPoolExecutor，(使用pool.submit提交任务过后都会返回future对象)
    2）重载Thread  Process类（重载run方法）（注意调用start只是调用了一个方法而已，调用start是开启线程默认会调用run）
    3）使用函数创建多线程

ThreadPoolExecutor

from concurrent.futures import ThreadPoolExecutor,Future

def action(a,b):
    print('hello,this is %s thread , %s'%(a,b))
if __name__ == '__main__':
    pool=ThreadPoolExecutor(max_workers=10)
    for each in range(0,6):
        future=pool.submit(action(each,2))
        print(type(future))





输出：
hello,this is 0 thread , 2

hello,this is 1 thread , 2

hello,this is 2 thread , 2

hello,this is 3 thread , 2

hello,this is 4 thread , 2

hello,this is 5 thread , 2

重载threading.Thread

class MyThread(threading.Thread):

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

    def run(self):
        print("this is thread "+self.name)
if __name__ == '__main__':
    thread1=MyThread("thread1")
    thread2 = MyThread("thread2")
    thread1.start()
    thread2.start()
    thread1.join()
    thread2.join()






输出：
this is thread thread1
this is thread thread2