CODEWITHSUNDEEP
pythonmultithreading
Rui SHI
Rui SHI

Reputation: 51

Is the python thread method different in IDLE and pycharm?

In fact, I run and debug these codes as below in both IDLE(Python 3.5.2 shell ) and Pycharm Community Edition 2017.2. But when I run the code many times, I found there are some questions confused me. The code run in pycharm generates this result:

The code run in pycharm generates this result:

As you can see, "1 3 2 3 1 2 1" and "2 3 1 2 3 1 2". I run many times and find this. So I just want to know, why the thread method is different in different IDE? And could you please tell me some good directions for learning thread in Python3?

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("Open Thread：" + self.name)
        process_data(self.name, self.q)
        print("Exit Thread：" + self.name)


def process_data(threadName, q):
    while not exitFlag:

        queueLock.acquire()
        if not workQueue.empty():
            data = q.get()
            print("%s processing %s" % (threadName, data))
            queueLock.release()
        else:
            queueLock.release()
        time.sleep(1)


threadList = ["Thread-1", "Thread-2", "Thread-3"]
nameList = ["One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight"]
queueLock = threading.Lock()
workQueue = queue.Queue(10)
threads = []
threadID = 1

for tname in threadList:
    thread = myThread(threadID, tname, workQueue)
    thread.start()
    threads.append(thread)
    threadID += 1

queueLock.acquire()
for word in nameList:
    #print(workQueue.empty())
    workQueue.put(word)
    #time.sleep(1)
queueLock.release()

while not workQueue.empty():
    pass

exitFlag = 1

for t in threads:
    t.join()

print("Exit Main Thread")

Upvotes: 4

Views: 837

Answers (1)

Netwave
Netwave

Reputation: 42756

Threads don't gurantee that they will execute in any order, thats why you are getting different results on differents executions. So the threads are not dependant on IDE

Upvotes: 1

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