线程计时

• 线程计时：

# -*- coding: utf-8 -*-
# @Time    : 2018/7/17 11:40
# @Author  : ll
# @File    : 计时.py

import time,threading

def run(n):
    print("task:",n)
    time.sleep(2)
    print("task done",n)
star_time = time.time()
print(star_time)
t_objs=[]
for i in range(50):
    t = threading.Thread(target=run,args=("t-%s" %i,))
    t.start()
    t_objs.append(t)
for t in t_objs:
    t.join()

print("---------all threads has finished --------")
print("cost:",time.time() - star_time)