threading 多线程

#add_thread
# View more python learning tutorial on my Youtube and Youku channel!!!

# Youtube video tutorial: https://www.youtube.com/channel/UCdyjiB5H8Pu7aDTNVXTTpcg
# Youku video tutorial: http://i.youku.com/pythontutorial

import threading

#def main():
#    print(threading.active_count())
#    print(threading.enumerate()) # see the thread list
#    print(threading.current_thread())

def thread_job():
    print('This is a thread of %s' % threading.current_thread())

def main():
    thread = threading.Thread(target=thread_job,)
    thread.start()
if __name__ == '__main__':
    main()

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#queue # View more python learning tutorial on my Youtube and Youku channel!!!   # Youtube video tutorial: https://www.youtube.com/channel/UCdyjiB5H8Pu7aDTNVXTTpcg # Youku video tutorial: http://i.youku.com/pythontutorial   import threading import time from queue import Queue   def job(l,q):     for i in range(len(l)):         l[i] = l[i]**2     q.put(l)   def multithreading():     q = Queue()     threads = []     data = [[1,2,3],[3,4,5],[4,4,4],[5,5,5]]     for i in range(4):         t = threading.Thread(target=job, args=(data[i], q))         t.start()         threads.append(t)     for thread in threads:         thread.join()     results = []     for _ in range(4):           results.append(q.get())     print(results)   if __name__ == '__main__':     multithreading()

　　

#join
# View more python learning tutorial on my Youtube and Youku channel!!!

# Youtube video tutorial: https://www.youtube.com/channel/UCdyjiB5H8Pu7aDTNVXTTpcg
# Youku video tutorial: http://i.youku.com/pythontutorial

import threading
import time
def thread_job():
    print('T1 start\n')
    for i in range(10):
        time.sleep(0.1)
    print('T1 finish\n')

def T2_job():
    print('T2 start\n')
    print('T2 finish\n')

def main():
    added_thread = threading.Thread(target=thread_job, name='T1')
    thread2 = threading.Thread(target=T2_job, name='T2')
    added_thread.start()
    thread2.start()
    thread2.join()
    added_thread.join()

    print('all done\n')

if __name__ == '__main__':
    main()

 

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#GIL # View more python learning tutorial on my Youtube and Youku channel!!!   # Youtube video tutorial: https://www.youtube.com/channel/UCdyjiB5H8Pu7aDTNVXTTpcg # Youku video tutorial: http://i.youku.com/pythontutorial   import threading from queue import Queue import copy import time   def job(l, q):     res = sum(l)     q.put(res)   def multithreading(l):     q = Queue()     threads = []     for i in range(4):         t = threading.Thread(target=job, args=(copy.copy(l), q), name='T%i' % i)         t.start()         threads.append(t)     [t.join() for t in threads]     total = 0     for _ in range(4):         total += q.get()     print(total)   def normal(l):     total = sum(l)     print(total)   if __name__ == '__main__':     l = list(range(1000000))     s_t = time.time()     normal(l*4)     print('normal: ',time.time()-s_t)     s_t = time.time()     multithreading(l)     print('multithreading: ', time.time()-s_t)

　　

#lock
# View more python learning tutorial on my Youtube and Youku channel!!!

# Youtube video tutorial: https://www.youtube.com/channel/UCdyjiB5H8Pu7aDTNVXTTpcg
# Youku video tutorial: http://i.youku.com/pythontutorial

import threading

def job1():
    global A, lock
    lock.acquire()
    for i in range(10):
        A += 1
        print('job1', A)
    lock.release()

def job2():
    global A, lock
    lock.acquire()
    for i in range(10):
        A += 10
        print('job2', A)
    lock.release()

if __name__ == '__main__':
    lock = threading.Lock()
    A = 0
    t1 = threading.Thread(target=job1)
    t2 = threading.Thread(target=job2)
    t1.start()
    t2.start()
    t1.join()
    t2.join()