手把手带你了解python多进程,多线程

import time
import multiprocessing
import os
def dance(who,num):
    print("dance父进程：{}".format(os.getppid()))
    for i in range(1,num+1):
        print("进行编号：{}————{}跳舞。。。{}".format(os.getpid(),who,i))
        time.sleep(0.5)
def sing(num):
    print("sing父进程：{}".format(os.getppid()))
    for i in range(1,num+1):
        print("进行编号：{}----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主进程{}".format(os.getpid()))
    start= time.time()
    #1 进程的创建与启动
    # # 1.1创建进程对象，注意dance不能加括号
    # # dance_process = multiprocessing.Process(target=dance)#1.无参数
    # 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启动进程
    # dance_process.start()
    # sing_process.start()
    #2.默认-主进程和子进程是分开的，主进程只要1s就可以完成，子进程要2s，主进程会等所有子进程执行完，再退出
    # 2.1子守护主进程,当主一但完成，子就断开(如qq一关闭，所有聊天窗口就没了).daemon=True
    work_process = multiprocessing.Process(target=work,daemon=True)
    work_process.start()
    time.sleep(1)
    print("主进程完成了！")#主进程和子进程是分开的，主进程只要1s就可以完成，子进程要2s，主进程会等所有子进程执行完，再退出
    print("main主进程花费时长：",time.time()-start)
    #

import time
import os
import threading
def dance(num):
    for i in range(num):
        print("进程编号：{}，线程编号：{}————跳舞。。。".format(os.getpid(),threading.current_thread()))
        time.sleep(1)
def sing(count):
    for i in range(count):
        print("进程编号：{}，线程编号：{}----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)#设置成守护主线程
    # 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("进程编号：{}主线程结束...用时{}".format(os.getpid(),(time.time()-start)))
    for i in range(10):#多线程之间执行是无序的，由cpu调度
        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("当前进程为：{}".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("目标文件已存在")
    file_list =os.listdir(source_dir)
    count=0
    #1多进程
    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)
#这里有主进程和子进程，通过打印可以看出，主进程在创建1，2，3，4，，，21过程中，子进程已有的开始执行，也就是说，每个进程是互不影响的
# 9
# 10
# 11
# 12
# 13
# 当前进程为：2936(当主进程创建第13个时，此时，第一个子进程开始工作)
# 14
# 当前进程为：10120
# 当前进程为：10440
# 15
# 当前进程为：9508
    # 2多线程
    # 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)