python多线程threading的使用

# coding: utf-8
import time
import threading

def print_str(i): 
    while(True):
        print ('thread',str(i),time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time())))
        time.sleep(1)

ths=[];
for x in range(0,10):  
    th=threading.Thread(target=print_str,args=(x,))
    th.start()
    ths.append(th)

for t in ths:
    t.join()