标签:创建 ext like 生产 inux ade def produce linu
完整代码
import threading
import requests
from lxml import etree
import os
from urllib import request
from queue import Queue
#案例:
#需要将多个页码对应页面中的图片进行爬取。
#两个队列:
#page_queue:存储每一个页面的页码链接
#img_queue:存储的是每一张图片的链接
headers = {
"User-Agent": "Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36"
" (KHTML, like Gecko) Chrome/73.0.3683.86 Mobile Safari/537.36"
}
class Producer(threading.Thread):
def __init__(self, page_queue, img_queue, *args, **kwargs):
super(Producer, self).__init__(*args, **kwargs)
self.page_queue = page_queue
self.img_queue = img_queue
def run(self):
while True:
if self.page_queue.empty():
break
url = self.page_queue.get()
self.parse_page(url)
def parse_page(self, url):
response = requests.get(url=url, headers=headers)
text = response.text
html = etree.HTML(text)
a_list = html.xpath(‘//*[@id="pic-detail"]/div/div[2]/div[2]/ul/li/div/div/a‘)
for a in a_list:
img_url = a.xpath(‘./img/@data-original‘)[0]
img_name = a.xpath(‘./p/text()‘)[0]+‘.jpg‘
print(img_name,img_url)
self.img_queue.put((img_url, img_name))
class Consumer(threading.Thread):
def __init__(self, page_queue, img_queue, *args, **kwargs):
super(Consumer, self).__init__(*args, **kwargs)
self.page_queue = page_queue
self.img_queue = img_queue
def run(self):
while True:
if self.page_queue.empty() and self.img_queue.empty():
break
img_url, img_name = self.img_queue.get()
request.urlretrieve(img_url, "imgs/" + img_name)
print(img_name + " 下载完成!")
# 定义一个主方法,该方法向处理方法中传值
def main():
page_queue = Queue(1000)
img_queue = Queue(1000)
#将前5页的页码链接存储到page_queue中
for x in range(1, 6):
url = "https://www.doutula.com/photo/list/?page=%d" % x
print(‘页码url:‘,url)
page_queue.put(url)
#创建了三个线程生产数据
for x in range(3):
t = Producer(page_queue, img_queue)
t.start()
#创建三个线程消费数据
for x in range(3):
t = Consumer(page_queue, img_queue)
t.start()
if __name__ == ‘__main__‘:
main()
标签:创建 ext like 生产 inux ade def produce linu
原文地址:https://www.cnblogs.com/remixnameless/p/13171358.html