Python爬虫练习之花瓣网

      前两天写的花瓣网爬虫，花瓣网是个瀑布式布局，而且下拉的时候发现要登录帐号。本来以为要用requests.post模拟登录，能够顺手练习一下的，结果不登陆帐号也照样可以爬取。一开始是打算用selenium的，后来运行的过程中发现太慢了，遂改用requests库。

import requests
from requests.exceptions import RequestException
import re
import os
from hashlib import md5
from multiprocessing.dummy import Pool as ThreadPool


def get_pictures(word, i):
    url = 'http://huaban.com/search/?q=' + word + '&page=' + str(i + 1) + '&per_page=20&wfl=1'
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.34 '
                      '40.84 Safari/537.36'
    }
    response = requests.get(url, headers=headers)
    if response.status_code == 200:
        html = response.text
        # 获得图片的key
        re_key = re.compile('file\":.*?key\":\"(.*?)\"', re.S)
        key_list = re.findall(re_key, html)[1:21]
        for img in key_list:
            download_img(img)


def download_img(img):
    url = 'http://img.hb.aicdn.com/' + img
    print('Downloding:', url)
    try:
        response = requests.get(url)
        if response.status_code == 200:
            save_image(response.content)
    except RequestException:
        print('Downloading Error!')


def save_image(content):
    file_path = '{0}/{1}.jpg'.format('D:\\Flower', md5(content).hexdigest())
    if not os.path.exists(file_path):
        with open(file_path, 'wb') as f:
            f.write(content)


def main(index):
    keyword = '宝儿姐'
    get_pictures(keyword, index)


if __name__ == '__main__':
    # log_in()
    page = 5
    group = [x for x in range(0, page)]
    pool = ThreadPool(8)
    pool.map(main, group)
    pool.close()
    pool.join()

      代码量不多，逻辑也不复杂，主要的就是对花瓣网分析，抓取图片的key并进行相应处理。运行该爬虫前先要建立相应的文件夹。没什么太难的地方，也就不多做分析了。如果想要详细了解原理可以参考该博客：

      https://blog.csdn.net/coder_pig/article/details/79209418