threading

import threading
import time

def run(n):
    print("task ",n )
    time.sleep(2)
    print("task done",n)

start_time = time.time()
t_objs = [] #存线程实例
for i in range(50):
    t = threading.Thread(target=run,args=("t-%s" %i ,))
    t.start()
    t_objs.append(t) #为了不阻塞后面线程的启动，不在这里join，先放到一个列表里

# for t in t_objs: #循环线程实例列表，等待所有线程执行完毕
#     t.join()


print("----------all threads has finished...")
print("cost:",time.time() - start_time)
# run("t1")
# run("t2")

#===================

import threading
import time

class MyThread(threading.Thread):
    def __init__(self,n,sleep_time):
        super(MyThread,self).__init__()
        self.n =  n
        self.sleep_time = sleep_time
    def run(self):
        print("runnint task ",self.n )
        time.sleep(self.sleep_time)
        print("task done,",self.n )


t1 = MyThread("t1",2)
t2 = MyThread("t2",4)

t1.start()
t2.start()

t1.join() #=wait()
t2.join()

print("main thread....")


#============================

import threading
import time

def run(n):
    print("task ",n )
    time.sleep(2)
    print("task done",n,threading.current_thread())

start_time = time.time()
t_objs = [] #存线程实例
for i in range(50):
    t = threading.Thread(target=run,args=("t-%s" %i ,))
    t.setDaemon(True) #把当前线程设置为守护线程
    t.start()
    t_objs.append(t) #为了不阻塞后面线程的启动，不在这里join，先放到一个列表里

# for t in t_objs: #循环线程实例列表，等待所有线程执行完毕
#     t.join()

time.sleep(2)
print("----------all threads has finished...",threading.current_thread(),threading.active_count())
print("cost:",time.time() - start_time)
# run("t1")
# run("t2")