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這篇文章將為大家詳細(xì)講解有關(guān)如何在Python3.5中使用多進(jìn)程,文章內(nèi)容質(zhì)量較高,因此小編分享給大家做個(gè)參考,希望大家閱讀完這篇文章后對(duì)相關(guān)知識(shí)有一定的了解。
具體如下:
進(jìn)程類(lèi):Process
示例及代碼:
(1)創(chuàng)建函數(shù)作為單進(jìn)程
#!/usr/bin/env python # -*- coding:utf-8 -*- # Author:ZhengzhengLiu import multiprocessing import time #創(chuàng)建函數(shù)并將其作為單個(gè)進(jìn)程 def worker(interval): n = 5 #進(jìn)程數(shù) while n>0: print("The time is :{0}".format(time.ctime())) #初始化時(shí)間 time.sleep(interval) #睡眠時(shí)間 n-=1 if __name__ == "__main__": # 創(chuàng)建進(jìn)程,target:調(diào)用對(duì)象,args:傳參數(shù)到對(duì)象 p = multiprocessing.Process(target=worker,args=(2,)) p.start() #開(kāi)啟進(jìn)程 print("進(jìn)程號(hào):",p.pid) print("進(jìn)程別名:",p.name) print("進(jìn)程存活狀態(tài):",p.is_alive())
運(yùn)行結(jié)果:
進(jìn)程號(hào): 6784
進(jìn)程別名: Process-1
進(jìn)程存活狀態(tài): True
The time is :Wed Nov 1 10:59:03 2017
The time is :Wed Nov 1 10:59:05 2017
The time is :Wed Nov 1 10:59:07 2017
The time is :Wed Nov 1 10:59:09 2017
The time is :Wed Nov 1 10:59:11 2017
(2)創(chuàng)建函數(shù)作為多進(jìn)程
#!/usr/bin/env python # -*- coding:utf-8 -*- # Author:ZhengzhengLiu import multiprocessing import time #創(chuàng)建函數(shù)作為多進(jìn)程 def work1(interval): print("work1...") time.sleep(interval) print("end work1...") def work2(interval): print("work2...") time.sleep(interval) print("end work2...") def work3(interval): print("work3...") time.sleep(interval) print("end work3...") if __name__ == "__main__": p1 = multiprocessing.Process(target=work1,args=(1,)) p2 = multiprocessing.Process(target=work2,args=(2,)) p3 = multiprocessing.Process(target=work3,args=(3,)) p1.start() p2.start() p3.start() print("The number of CPU is %d:"%(multiprocessing.cpu_count())) #打印CPU核數(shù) for p in multiprocessing.active_children(): #循環(huán)打印子進(jìn)程的名稱(chēng)和pid print("子進(jìn)程名稱(chēng):%s,子進(jìn)程pid:%d" %(p.name,p.pid)) print("ending....")
運(yùn)行結(jié)果:
The number of CPU is 4:
子進(jìn)程名稱(chēng):Process-2,子進(jìn)程pid:7108
子進(jìn)程名稱(chēng):Process-1,子進(jìn)程pid:1896
子進(jìn)程名稱(chēng):Process-3,子進(jìn)程pid:7952
ending....
work3...
work1...
work2...
end work1...
end work2...
end work3...
注:先運(yùn)行主進(jìn)程的內(nèi)容,再運(yùn)行子進(jìn)程
(3)將進(jìn)程定義成一個(gè)類(lèi)
#!/usr/bin/env python # -*- coding:utf-8 -*- # Author:ZhengzhengLiu import multiprocessing import time #將進(jìn)程定義為一個(gè)類(lèi) class ClockProcess(multiprocessing.Process): def __init__(self,interval): multiprocessing.Process.__init__(self) #重構(gòu)了Process類(lèi)里面的構(gòu)造函數(shù) self.interval = interval def run(self): #固定用run方法,啟動(dòng)進(jìn)程自動(dòng)調(diào)用run方法 n = 5 while n>0: print("The time is {0}".format(time.ctime())) time.sleep(self.interval) n-=1 if __name__ == "__main__": p = ClockProcess(2) p.start()
運(yùn)行結(jié)果:
The time is Wed Nov 1 11:31:28 2017
The time is Wed Nov 1 11:31:30 2017
The time is Wed Nov 1 11:31:32 2017
The time is Wed Nov 1 11:31:34 2017
The time is Wed Nov 1 11:31:36 2017
(4)Queue(隊(duì)列)實(shí)現(xiàn)多進(jìn)程數(shù)據(jù)傳輸
#!/usr/bin/env python # -*- coding:utf-8 -*- # Author:ZhengzhengLiu import multiprocessing #Queue是多進(jìn)程安全的隊(duì)列,可以使用實(shí)現(xiàn)多進(jìn)程之間的數(shù)據(jù)傳遞 def writer_proc(q): try: q.put(1,block=False) #put方法插入數(shù)據(jù)到隊(duì)列中 except: pass def reader_proc(q): try: print(q.get(block=False)) #get方法從隊(duì)列中讀取并刪除一個(gè)元素 except: pass if __name__ == "__main__": q = multiprocessing.Queue() writer = multiprocessing.Process(target=writer_proc,args=(q,)) writer.start() reader = multiprocessing.Process(target=reader_proc,args=(q,)) reader.start() reader.join() writer.join()
運(yùn)行結(jié)果:
1
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