[Python知识库]Python多进程之进程池的使用

下载txt文件中的所有链接的图片

代码实现

from multiprocessing import Manager, Pool
import time
import os
import re

import requests

img_date_path = './img'

headers = {'Agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:88.0) Gecko/20100101 Firefox/88.0'}


def open_url(q):
    # 取出链接
    if not q.full():  # 判断队列是否满
        with open('./url_202106031526.txt', 'r') as f:
            img_url = f.read().split()
        print(len(img_url))
        for i in range(len(img_url)):
            q.put(img_url[i])


def download(q):
    # 对链接进行下载
    while not q.empty():
        img_url = q.get(True, 2)
        response = requests.get(url=img_url, headers=headers, timeout=5, stream=True)
        a = re.findall('[u9fa5a-zA-Z0-9]+', img_url, re.S)  # 正则提出标点符号以外的所有内容
        name = "".join(a)
        print('正在下载%s' % name)
        with open("%s/%s.jpg" % (img_date_path, name), "wb") as f:
            f.write(response.content)
            time.sleep(0.01)


if __name__ == '__main__':
    t1 = time.time()
    print("(%s) start" % os.getpid())
    q = Manager().Queue()
    po = Pool(8)
    po.apply_async(open_url, (q,))
    # 先让上面的任务向Queue存入数据，然后再让下面的任务开始从中取数据
    for i in range(5):
        po.apply_async(download, (q,))
    po.close()
    po.join()
    print("(%s) End" % os.getpid())
    t2 = time.time()
    print(t2 - t1)

文件链接

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