进程

1.进程:数据是不共享的

     - 1.进程之间数据是不共享的

import multiprocessing

lst=[]

def task(arg):

    lst.append(arg)

    print(lst)

def fun():

    for i in range(10):

        p=multiprocessing.Process(target=task,args=(i,))

        p.start()

if __name__ == '__main__':

    fun()

        -2.通过继承的方式来创建进程

import multiprocessing

class Myprosess(multiprocessing.Process):

    def run(self):

        print("当前的线程是multiprocessing.process")

def run():

    p1=Myprosess()

    p1.start()

if __name__ == '__main__':

    run()

name方法：获取当前线程的名字

     import multiprocessing

import time

def task(arg):

    name=multiprocessing.current_process()

    time.sleep(2)

    print(name,arg)

def run():

    print(123)

    p=multiprocessing.Process(target=task,args=(000,))

    p.name="Jave Yang"

    # name=multiprocessing.current_process()

    p.start()

    print(11212313)

if __name__ == '__main__':

    run()

ident/pip方法：查看ID

import time

def task(arg):

    name=multiprocessing.current_process().ident

    time.sleep(2)

    print(name,arg)

def run():

    print(123)

    p=multiprocessing.Process(target=task,args=(000,))

    p.name="Jave Yang"

    # name=multiprocessing.current_process()

    p.start()

    print(11212313)

if __name__ == '__main__':

    run()

deamon方法：主线程停，子线程必须停

import multiprocessing

def func(arg):

    time.sleep(2)

    print(arg)

def run():

    t=multiprocessing.Process(target=func,args=(20,))

    t.daemon=False

    t.start()

if __name__ == '__main__':

    run()

join方法：人为的控制让主线程等待子线程

import multiprocessing

def func(arg):

    time.sleep(2)

    print(arg)

print(123)

def run():

    t=multiprocessing.Process(target=func,args=(20,))



    t.start()

    t.join(3)



if __name__ == '__main__':

    run()

 

常用功能:

              join,deamon,name, multiprocessing.current_process().ident/pip

           

 

2.进程的数据共享

linux（Queue）

import multiprocessing

q=multiprocessing.Queue()

def task(arg):

    # time.sleep(2)

    q.put(arg)

    # print(arg)

def fun():

    for i in range(10):

        p=multiprocessing.Process(target=task,args=(i,))

        p.start()

    while 1:

        v=q.get()

        print(v)

if __name__ == '__main__':

    fun()

linux(Manger)

m = multiprocessing.Manager()

dic = m.dict()

def task(arg):

    dic[arg] = 100

def run():

    for i in range(10):

        p = multiprocessing.Process(target=task, args=(i,))

        p.start()

    input('>>>')

    print(dic.values())

if __name__ == '__main__':

    run()

windows(Queue)

def task(arg,q):

    q.put(arg)



if __name__ == '__main__':

    q = multiprocessing.Queue()

    for i in range(10):

        p = multiprocessing.Process(target=task,args=(i,q,))

        p.start()

    while True:

        v = q.get()

        print(v)

linux(Queue)

def task(arg,dic):

    time.sleep(2)

    dic[arg] = 100

if __name__ == '__main__':

    m = multiprocessing.Manager()

    dic = m.dict()

    process_list = []

    for i in range(10):

        p = multiprocessing.Process(target=task, args=(i, dic,))

        p.start()

        process_list.append(p)

    while True:

        count = 0

        for p in process_list:

            if not p.is_alive():

                count += 1

        if count == len(process_list):

            break

    print(dic)

 

     

3.锁

import multiprocessing



lock = multiprocessing.RLock()



def task(arg):

    print('鬼子来了')

    lock.acquire()

    time.sleep(2)

    print(arg)

    lock.release()



if __name__ == '__main__':

    p1 = multiprocessing.Process(target=task,args=(1,))

    p1.start()



    p2 = multiprocessing.Process(target=task, args=(2,))

    p2.start()

 

4.进程池

import time

from concurrent.futures import ThreadPoolExecutor,ProcessPoolExecutor

def task(arg):

    time.sleep(2)

    print(arg)

if __name__ == '__main__':

    pool=ProcessPoolExecutor(5)

    for i in range(10):

        pool.submit(task,i)

5.模块（爬虫）

import requests
from bs4 import BeautifulSoup
from concurrent.futures import ThreadPoolExecutor,ProcessPoolExecutor
def task(url):#把网址当做参数传进去
    print(url)
    r1=requests.get(url=url,
                    headers=
                    {'User-Agent':'Mozilla/5.0 (Windows NT 10.0; WOW64; rv:62.0) Gecko/20100101 Firefox/62.0'})
    ## #伪装浏览器来进行访问
    # print(r1.text)

    soup=BeautifulSoup(r1.text,'html.parser')#使用某种方法来获取到你要趴下来的内容
    content_list=soup.find('div',attrs={'id':'content-list'})#找到当前块
    # print(soup.text)
    # print(content_list)
    for item in content_list.find_all('div',attrs={'class':'item'}):

        #拿到div下的class=item
        # print(item)
        title = item.find("a").text.strip()#拿到所有的文字,并做字符串的相关处理
        print(title)
        title_url=item.find('a').get('href')#获取到网址
        print(title_url)
def run ():
    pool=ProcessPoolExecutor(20)#创建20个线程
    for i in range(1,121):
        pool.submit(task,'https://dig.chouti.com/all/hot/recent/%s' %i)
if __name__ == '__main__':
    run()