_thread 和 threading兩個(gè)工具包
threading.Thread()類 和threading.Lock()類
（一）創(chuàng)建線程
兩種方法冒窍，一種
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 ("開始線程：" + self.name)
print_time(self.name, self.counter, 5)
print ("退出線程：" + 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
# 創(chuàng)建新線程
thread1 = myThread(1, "Thread-1", 1)
thread2 = myThread(2, "Thread-2", 2)
# 開啟新線程
thread1.start()
thread2.start()
thread1.join()
thread2.join()
print ("退出主線程")
（二）線程同步 Lock類 以及Lock.acquire() 和Lock.release()兩種方法
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 ("開啟線程： " + self.name)
# 獲取鎖递沪，用于線程同步
threadLock.acquire()
print_time(self.name, self.counter, 3)
# 釋放鎖，開啟下一個(gè)線程
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 = []
# 創(chuàng)建新線程
thread1 = myThread(1, "Thread-1", 1)
thread2 = myThread(2, "Thread-2", 2)
# 開啟新線程
thread1.start()
thread2.start()
# 添加線程到線程列表
threads.append(thread1)
threads.append(thread2)
# 等待所有線程完成
for t in threads:
t.join()
print ("退出主線程")
（三）Queue線程隊(duì)列
Queue 模塊中的常用方法:
Queue.qsize() 返回隊(duì)列的大小
Queue.empty() 如果隊(duì)列為空综液，返回True,反之False
Queue.full() 如果隊(duì)列滿了款慨，返回True,反之False
Queue.full 與 maxsize 大小對(duì)應(yīng)
Queue.get([block[, timeout]])獲取隊(duì)列，timeout等待時(shí)間
Queue.get_nowait() 相當(dāng)Queue.get(False)
Queue.put(item) 寫入隊(duì)列谬莹，timeout等待時(shí)間
Queue.put_nowait(item) 相當(dāng)Queue.put(item, False)
Queue.task_done() 在完成一項(xiàng)工作之后檩奠，Queue.task_done()函數(shù)向任務(wù)已經(jīng)完成的隊(duì)列發(fā)送一個(gè)信號(hào)
Queue.join() 實(shí)際上意味著等到隊(duì)列為空，再執(zhí)行別的操作
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 ("開啟線程：" + self.name)
process_data(self.name, self.q)
print ("退出線程：" + 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
# 創(chuàng)建新線程
for tName in threadList:
thread = myThread(threadID, tName, workQueue)
thread.start()
threads.append(thread)
threadID += 1
# 填充隊(duì)列
queueLock.acquire()
for word in nameList:
workQueue.put(word)
queueLock.release()
# 等待隊(duì)列清空
while not workQueue.empty():
pass
# 通知線程是時(shí)候退出
exitFlag = 1
# 等待所有線程完成
for t in threads:
t.join()
print ("退出主線程")
