python多线程并发测试

# encoding: UTF-8
 
import threading
import time
 
exitFlag = 0
 
class myThread (threading.Thread):   #继承父类threading.Thread
    def __init__(self, threadID, name, counter):
        threading.Thread.__init__(self)
        self.threadID = threadID
        self.name = name
        self.counter = counter
    def run(self):                   #把要执行的代码写到run函数里面 线程在创建后会直接运行run函数 
        print("Starting " + self.name)
        print_time(self.name, self.counter, 1)      # 这里的最后一个参数1是指循环次数（1次）
        print("Exiting " + self.name)
 
def print_time(threadName, delay, counter):
    while counter:
        if exitFlag:
            (threading.Thread).exit()
        time.sleep(delay)
        print("%s: %s" % (threadName, time.ctime(time.time())))
        counter -= 1
 
# 创建新线程
thread1 = myThread(1, "Thread-1", 1)
thread2 = myThread(2, "Thread-2", 1)
 
# 开启线程
i = 0
for i in range(5):                                       #  这里的range(5)是指线程数（5个）
	print("第{}次执行".format(i))
	myThread(1, "Thread-1", 1).start()
	# thread1.start()
	# thread2.start()
	
 
print("Exiting Main Thread")