Python多线程使用方法详细讲解

import _thread
import time
# 为线程定义一个函数
def print_time( threadName, delay):
   count = 0
   while count < 5:
      time.sleep(delay)
      count  = 1
      print ("%s: %s" % ( threadName, time.ctime(time.time()) ))
# 创建两个线程
try:
   _thread.start_new_thread( print_time, ("Thread-1", 2, ) )
   _thread.start_new_thread( print_time, ("Thread-2", 4, ) )
except:
   print ("Error: 无法启动线程")
while 1:
   pass

import threading
import time
exitFlag = 0
class myThread (threading.Thread):
    def __init__(self, threadID, name, counter):
        threading.Thread.__init__(self)
        self.threadID = threadID
        self.name = name
        self.counter = counter
    def run(self):
        print ("开始线程："   self.name)
        print_time(self.name, self.counter, 5)
        print ("退出线程："   self.name)
def print_time(threadName, delay, counter):
    while counter:
        if exitFlag:
            threadName.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", 2)
# 开启新线程
thread1.start()
thread2.start()
thread1.join()
thread2.join()
print ("退出主线程")

import threading
import time
class myThread (threading.Thread):
    def __init__(self, threadID, name, counter):
        threading.Thread.__init__(self)
        self.threadID = threadID
        self.name = name
        self.counter = counter
    def run(self):
        print ("开启线程： "   self.name)
        # 获取锁，用于线程同步
        threadLock.acquire()
        print_time(self.name, self.counter, 3)
        # 释放锁，开启下一个线程
        threadLock.release()
def print_time(threadName, delay, counter):
    while counter:
        time.sleep(delay)
        print ("%s: %s" % (threadName, time.ctime(time.time())))
        counter -= 1
threadLock = threading.Lock()
threads = []
# 创建新线程
thread1 = myThread(1, "Thread-1", 1)
thread2 = myThread(2, "Thread-2", 2)
# 开启新线程
thread1.start()
thread2.start()
# 添加线程到线程列表
threads.append(thread1)
threads.append(thread2)
# 等待所有线程完成
for t in threads:
    t.join()
print ("退出主线程")

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import queue
#创建基本队列
#queue.Queue(maxsize=0)创建一个队列对象（队列容量），若maxsize小于或者等于0，队列大小没有限制
Q=queue.Queue(10)
print(Q)
print(type(Q))
#1.基本方法
print(Q.queue)#查看队列中所有元素
print(Q.qsize())#返回队列的大小
print(Q.empty())#判断队空
print(Q.full())#判断队满
#2.获取队列，0--5
#Queue.put（item，block = True，timeout = None ）将对象放入队列，阻塞调用（block=False抛异常），无等待时间
for i in range(5):
    Q.put(i)
# Queue.put_nowait(item)相当于 put(item, False).
#3.读队列，0--5
#Queue.get(block=True, timeout=None)读出队列的一个元素，阻塞调用，无等待时间
while not Q.empty():
    print(Q.get())
# Queue.get_nowait()相当于get(False).取数据，如果没数据抛queue.Empty异常
#4.另两种涉及等待排队任务的方法
# Queue.task_done()在完成一项工作后，向任务已经完成的队列发送一个信号
# Queue.join()阻止直到队列中的所有项目都被获取并处理。即等到队列为空再执行别的操作

import queue
import threading
import time
exitFlag = 0
class myThread (threading.Thread):
    def __init__(self, threadID, name, q):
        threading.Thread.__init__(self)
        self.threadID = threadID
        self.name = name
        self.q = q
    def run(self):
        print ("开启线程："   self.name)
        process_data(self.name, self.q)
        print ("退出线程："   self.name)
def process_data(threadName, q):
    while not exitFlag:
        queueLock.acquire()
        if not workQueue.empty():
            data = q.get()
            queueLock.release()
            print ("%s processing %s" % (threadName, data))
        else:
            queueLock.release()
        time.sleep(1)
threadList = ["Thread-1", "Thread-2", "Thread-3"]
nameList = ["One", "Two", "Three", "Four", "Five"]
queueLock = threading.Lock()
workQueue = queue.Queue(10)
threads = []
threadID = 1
# 创建新线程
for tName in threadList:
    thread = myThread(threadID, tName, workQueue)
    thread.start()
    threads.append(thread)
    threadID  = 1
# 填充队列
queueLock.acquire()
for word in nameList:
    workQueue.put(word)
queueLock.release()
# 等待队列清空
while not workQueue.empty():
    pass
# 通知线程是时候退出
exitFlag = 1
# 等待所有线程完成
for t in threads:
    t.join()
print ("退出主线程")