threading 两种调用方法

方法一：建议使用，比较方便简单

import threading
import  time


def  runthreading(n):
    print('run...',n)
    time.sleep(2)

t1 = threading.Thread(target=runthreading,args=("threading1",))
t2 = threading.Thread(target=runthreading,args=("threading2",))

t1.start()
t2.start()

方法二：

import threading
import  time

class mythreading(threading.Thread):

    def __init__(self,n):
        #super(mythreading,self).__init__()
        threading.Thread.__init__(self)
        self.n = n
    def run(self):
        print('run...',self.n)


t1 = mythreading("t1")
t2 = mythreading("t2")
t1.start()
t2.start()

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计算所有线程总的执行时间：

import threading
import  time

time_start = time.time()

def  runthreading(n):
    print('run...',n)
    time.sleep(2)

obj_list = []
for i in range(50):
    t1 = threading.Thread(target=runthreading,args=("t----%s"%i,))
    t1.start()
    obj_list.append(t1)

for t in obj_list:
    t.join()

print(time.time() - time_start)