手把手帶你了解python多進(jìn)程,多線程

import time
import multiprocessing
import os
def dance(who,num):
    print("dance父進(jìn)程：{}".format(os.getppid()))
    for i in range(1,num+1):
        print("進(jìn)行編號(hào)：{}————{}跳舞。。。{}".format(os.getpid(),who,i))
        time.sleep(0.5)
def sing(num):
    print("sing父進(jìn)程：{}".format(os.getppid()))
    for i in range(1,num+1):
        print("進(jìn)行編號(hào)：{}----唱歌。。。{}".format(os.getpid(),i))
        time.sleep(0.5)
def work():
    for i in range(10):
        print("工作中。。。")
        time.sleep(0.2)
if __name__ == '__main__':
    # print("main主進(jìn)程{}".format(os.getpid()))
    start= time.time()
    #1 進(jìn)程的創(chuàng)建與啟動(dòng)
    # # 1.1創(chuàng)建進(jìn)程對(duì)象，注意dance不能加括號(hào)
    # # dance_process = multiprocessing.Process(target=dance)#1.無參數(shù)
    # dance_process=multiprocessing.Process(target=dance,args=("lin",3))#2.以args=元祖方式
    # sing_process = multiprocessing.Process(target=sing,kwargs={"num":3})#3.以kwargs={}字典方式
    # # 1.2啟動(dòng)進(jìn)程
    # dance_process.start()
    # sing_process.start()
    #2.默認(rèn)-主進(jìn)程和子進(jìn)程是分開的，主進(jìn)程只要1s就可以完成，子進(jìn)程要2s，主進(jìn)程會(huì)等所有子進(jìn)程執(zhí)行完，再退出
    # 2.1子守護(hù)主進(jìn)程,當(dāng)主一但完成，子就斷開(如qq一關(guān)閉，所有聊天窗口就沒了).daemon=True
    work_process = multiprocessing.Process(target=work,daemon=True)
    work_process.start()
    time.sleep(1)
    print("主進(jìn)程完成了！")#主進(jìn)程和子進(jìn)程是分開的，主進(jìn)程只要1s就可以完成，子進(jìn)程要2s，主進(jìn)程會(huì)等所有子進(jìn)程執(zhí)行完，再退出
    print("main主進(jìn)程花費(fèi)時(shí)長(zhǎng)：",time.time()-start)
    #

import time
import os
import threading
def dance(num):
    for i in range(num):
        print("進(jìn)程編號(hào)：{}，線程編號(hào)：{}————跳舞。。。".format(os.getpid(),threading.current_thread()))
        time.sleep(1)
def sing(count):
    for i in range(count):
        print("進(jìn)程編號(hào)：{}，線程編號(hào)：{}----唱歌。。。".format(os.getpid(),threading.current_thread()))
        time.sleep(1)
def task():
    time.sleep(1)
    thread=threading.current_thread()
    print(thread)
if __name__ == '__main__':
    # start=time.time()
    # # sing_thread =threading.Thread(target=dance,args=(3,),daemon=True)#設(shè)置成守護(hù)主線程
    # sing_thread = threading.Thread(target=dance, args=(3,))
    # dance_thread = threading.Thread(target=sing,kwargs={"count":3})
    #
    # sing_thread.start()
    # dance_thread.start()
    #
    # time.sleep(1)
    # print("進(jìn)程編號(hào)：{}主線程結(jié)束...用時(shí){}".format(os.getpid(),(time.time()-start)))
    for i in range(10):#多線程之間執(zhí)行是無序的，由cpu調(diào)度
        sub_thread = threading.Thread(target=task)
        sub_thread.start()

import threading
import time
lock =threading.Lock()
class Sum_tickets:
    def __init__(self,tickets):
        self.tickets=tickets
def window(sum_tickets):
    while True:
        with lock:
            if sum_tickets.tickets>0:
                time.sleep(0.2)
                print(threading.current_thread().name,"取票{}".format(sum_tickets.tickets))
                sum_tickets.tickets-=1
            else:
                break
if __name__ == '__main__':
    sum_tickets=Sum_tickets(10)
    sub_thread1 = threading.Thread(name="窗口1",target=window,args=(sum_tickets,))
    sub_thread2 = threading.Thread(name="窗口2",target=window,args=(sum_tickets,))
    sub_thread1.start()
    sub_thread2.start()

import os
import multiprocessing
import threading
import time
def copy_file(file_name,source_dir,dest_dir):
    source_path = source_dir+"/"+file_name
    dest_path =dest_dir+"/"+file_name
    print("當(dāng)前進(jìn)程為：{}".format(os.getpid()))
    with open(source_path,"rb") as source_file:
        with open(dest_path,"wb") as dest_file:
            while True:
                data=source_file.read(1024)
                if data:
                    dest_file.write(data)
                else:
                    break
    pass
if __name__ == '__main__':
    source_dir=r'C:\Users\Administrator\Desktop\注意力'
    dest_dir=r'C:\Users\Administrator\Desktop\test'
    start = time.time()
    try:
        os.mkdir(dest_dir)
    except:
        print("目標(biāo)文件已存在")
    file_list =os.listdir(source_dir)
    count=0
    #1多進(jìn)程
    for file_name in file_list:
        count+=1
        print(count)
        sub_processor=multiprocessing.Process(target=copy_file,
                                args=(file_name,source_dir,dest_dir))
        sub_processor.start()
        # time.sleep(20)
    print(time.time()-start)
#這里有主進(jìn)程和子進(jìn)程，通過打印可以看出，主進(jìn)程在創(chuàng)建1，2，3，4，，，21過程中，子進(jìn)程已有的開始執(zhí)行，也就是說，每個(gè)進(jìn)程是互不影響的
# 9
# 10
# 11
# 12
# 13
# 當(dāng)前進(jìn)程為：2936(當(dāng)主進(jìn)程創(chuàng)建第13個(gè)時(shí)，此時(shí)，第一個(gè)子進(jìn)程開始工作)
# 14
# 當(dāng)前進(jìn)程為：10120
# 當(dāng)前進(jìn)程為：10440
# 15
# 當(dāng)前進(jìn)程為：9508
    # 2多線程
    # for file_name in file_list:
    #     count += 1
    #     print(count)
    #     sub_thread = threading.Thread(target=copy_file,
    #                                             args=(file_name, source_dir, dest_dir))
    #     sub_thread.start()
    #     # time.sleep(20)
    # print(time.time() - start)