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创建进程的类：Process([group [, target [, name [, args [, kwargs]]]]])，target表示调用对象，args表示调用对象的位置参数元组。kwargs表示调用对象的字典。name为别名。group实质上不使用。
方法：is_alive()、join([timeout])、run()、start()、terminate()。其中，Process以start()启动某个进程。
属性：authkey、daemon（要通过start()设置）、exitcode(进程在运行时为None、如果为–N，表示被信号N结束）、name、pid。其中daemon是父进程终止后自动终止，且自己不能产生新进程，必须在start()之前设置。
例1.1：创建函数并将其作为单个进程
import multiprocessing import time def worker(interval): n = 5 while n > 0: print("The time is {0}".format(time.ctime())) time.sleep(interval) n -= 1 if __name__ == "__main__": p = multiprocessing.Process(target = worker, args = (1,)) #target表示调用对象，args传入调用对象的参数元组# p.start() print ("p.pid:", p.pid) print ("p.name:", p.name) print ("p.is_alive:", p.is_alive())
结果：
p.pid: 8736 p.name: Process-1 p.is_alive: True The time is Tue Apr 21 20:55:12 2015 The time is Tue Apr 21 20:55:15 2015 The time is Tue Apr 21 20:55:18 2015 The time is Tue Apr 21 20:55:21 2015 The time is Tue Apr 21 20:55:24 2015
例1.2：创建函数并将其作为多个进程
import multiprocessing import time def worker_1(interval): print ("worker_1") time.sleep(interval) print ("end worker_1") def worker_2(interval): print ("worker_2") time.sleep(interval) print ("end worker_2") def worker_3(interval): print ("worker_3") time.sleep(interval) print ("end worker_3") if __name__ == "__main__": p1 = multiprocessing.Process(target = worker_1, args = (2,)) p2 = multiprocessing.Process(target = worker_2, args = (3,)) p3 = multiprocessing.Process(target = worker_3, args = (4,)) p1.start() p2.start() p3.start() print("The number of CPU is:" + str(multiprocessing.cpu_count())) for p in multiprocessing.active_children(): print("child p.name:" + p.name + "\tp.id" + str(p.pid)) print ("END!!!!!!!!!!!!!!!!!")
结果：
The number of CPU is:4 child p.name:Process-3 p.id7992 child p.name:Process-2 p.id4204 child p.name:Process-1 p.id6380 END!!!!!!!!!!!!!!!!! worker_1 worker_3 worker_2 end worker_1 end worker_2 end worker_3
例1.3：将进程定义为类
import multiprocessing import time class ClockProcess(multiprocessing.Process): def __init__(self, interval): multiprocessing.Process.__init__(self) self.interval = interval def run(self): n = 5 while n > 0: print("the time is {0}".format(time.ctime())) time.sleep(self.interval) n -= 1 if __name__ == ‘__main__‘: p = ClockProcess(3) p.start()
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原文地址：http://www.cnblogs.com/singeldiego/p/5256610.html
