python(threading 线程模块 循环多线程执行)

# Author:Sooele

import threading   #线程模块
import time
def run(n):
    print("task",n)
    time.sleep(2)
start_time = time.time()
for i in range(50):
    t = threading.Thread(target=run,args=("t-%s"%i,))
    t.start()
print("cost:",time.time()-start_time)