Python線程，切記Python的GIL特性

import threadingdef func():print(threading.current_thread().getName())passclass MyThread(threading.Thread):def run(self):print(threading.current_thread().getName())def main():print(threading.current_thread().getName())#創建線程thread = threading.Thread(target=func)thread.start()#thread.join()#創建線程t2 = MyThread()t2.start()t2.join()print("programs is finished.")if __name__ == "__main__":main() ?輸出

MainThread
Thread-1
Thread-2
programs is finished.

Python進程

import multiprocessing import osdef worker():print( "Child ProcessID:" + str(os.getpid()) )print("working...")def main():print( "Main ProcessID:" + str(os.getpid()) )#創建進程p = multiprocessing.Process(target=worker)p.start();p.join();print("programs is finished.")if __name__ == "__main__":main() ?
輸出?

Main ProcessID:33452
Child ProcessID:616
working...
programs is finished.

Python進程池

import multiprocessing from multiprocessing import Pool import os import timedef worker(i):print( "Child ProcessID:" + str(os.getpid()) )print("working..." + str(i))time.sleep(1)def callback(arg):print(arg)def main():print( "Main ProcessID:" + str(os.getpid()) )pool = Pool(4)#創建進程for i in range(10):pool.apply(func=worker, args=(i,))#pool.apply(func=worker, args=(i,), callback=callback)print("programs is finished.")if __name__ == "__main__":main()
輸出

Main ProcessID:27824
Child ProcessID:23104
working...0
Child ProcessID:32968
working...1
Child ProcessID:26228
working...2
Child ProcessID:31036
working...3
Child ProcessID:23104
working...4
Child ProcessID:32968
working...5
Child ProcessID:26228
working...6
Child ProcessID:31036
working...7
Child ProcessID:23104
working...8
Child ProcessID:32968
working...9
programs is finished.

Python協程一

import asyncio@asyncio.coroutine def hello():print("hello the world")r = yield from asyncio.sleep(1)print("hello again")def main():loop = asyncio.get_event_loop()"""tasks = [asyncio.ensure_future(hello()),]loop.run_until_complete(asyncio.wait(tasks))"""print("begin")loop.run_until_complete(hello())print("end")loop.close()print("program is finished.")if __name__ == "__main__":main()
Python協程二

import asyncioasync def hello():print("hello the world")r = await asyncio.sleep(1)print("hello again")def main():loop = asyncio.get_event_loop()"""tasks = [asyncio.ensure_future(hello()),]loop.run_until_complete(asyncio.wait(tasks))"""print("begin")loop.run_until_complete(hello())print("end")loop.close()print("program is finished.")if __name__ == "__main__":main()
輸出

begin
hello the world
hello again
end
program is finished.

總結

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