Python线程、进程、进程池、协程

Python线程，切记Python的GIL特性

import threading def func(): print(threading.current_thread().getName()) pass class MyThread(threading.Thread): def run(self): print(threading.current_thread().getName()) def main(): print(threading.current_thread().getName()) #创建线程 thread = threading.Thread(target=func) thread.start() #thread.join() #创建线程 t2 = MyThread() t2.start() t2.join() print("programs is finished.") if __name__ == "__main__": main()  输出

MainThread Thread-1 Thread-2 programs is finished.

Python进程

import multiprocessing import os def worker(): print( "Child ProcessID:" + str(os.getpid()) ) print("working...") def main(): print( "Main ProcessID:" + str(os.getpid()) ) #创建进程 p = multiprocessing.Process(target=worker) p.start(); p.join(); print("programs is finished.") if __name__ == "__main__": main()   输出 

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

Python进程池

import multiprocessing from multiprocessing import Pool import os import time def 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) #创建进程 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() 输出

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协程一

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协程二

import asyncio async 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() 输出

begin hello the world hello again end program is finished.