2. 技术博客
  3. 05步python

05步python

tech2022-11-06  91
import requests from lxml import etree import time import csv from urllib.request import urlopen, Request from lxml import etree def crow_first(n): # 定义函数抓取每页前30条商品信息 # 构造每一页的url变化 url = 'https://search.jd.com/Search?keyword=%E6%89%8B%E6%9C%BA&enc=utf-8&qrst=1&rt=1&stop=1&vt=2&cid2=653&cid3=655&page=' head = {'authority': 'search.jd.com', 'method': 'GET', 'path': '/s_new.php?keyword=%E6%89%8B%E6%9C%BA&enc=utf-8&qrst=1&rt=1&stop=1&vt=2&wq=%E6%89%8B%E6%9C%BA&cid2=653&cid3=655&page=4&s=84&scrolling=y&log_id=1529828108.22071&tpl=3_M&show_items=7651927,7367120,7056868,7419252,6001239,5934182,4554969,3893501,7421462,6577495,26480543553,7345757,4483120,6176077,6932795,7336429,5963066,5283387,25722468892,7425622,4768461', 'scheme': 'https', 'referer': 'https://search.jd.com/Search?keyword=%E6%89%8B%E6%9C%BA&enc=utf-8&qrst=1&rt=1&stop=1&vt=2&wq=%E6%89%8B%E6%9C%BA&cid2=653&cid3=655&page=3&s=58&click=0', 'user-agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36', 'x-requested-with': 'XMLHttpRequest', 'Cookie': 'qrsc=3; pinId=RAGa4xMoVrs; xtest=1210.cf6b6759; ipLocation=%u5E7F%u4E1C; _jrda=5; TrackID=1aUdbc9HHS2MdEzabuYEyED1iDJaLWwBAfGBfyIHJZCLWKfWaB_KHKIMX9Vj9_2wUakxuSLAO9AFtB2U0SsAD-mXIh5rIfuDiSHSNhZcsJvg; shshshfpa=17943c91-d534-104f-a035-6e1719740bb6-1525571955; shshshfpb=2f200f7c5265e4af999b95b20d90e6618559f7251020a80ea1aee61500; cn=0; 3AB9D23F7A4B3C9B=QFOFIDQSIC7TZDQ7U4RPNYNFQN7S26SFCQQGTC3YU5UZQJZUBNPEXMX7O3R7SIRBTTJ72AXC4S3IJ46ESBLTNHD37U; ipLoc-djd=19-1607-3638-3638.608841570; __jdu=930036140; user-key=31a7628c-a9b2-44b0-8147-f10a9e597d6f; areaId=19; __jdv=122270672|direct|-|none|-|1529893590075; PCSYCityID=25; mt_xid=V2_52007VwsQU1xaVVoaSClUA2YLEAdbWk5YSk9MQAA0BBZOVQ0ADwNLGlUAZwQXVQpaAlkvShhcDHsCFU5eXENaGkIZWg5nAyJQbVhiWR9BGlUNZwoWYl1dVF0%3D; __jdc=122270672; shshshfp=72ec41b59960ea9a26956307465948f6; rkv=V0700; __jda=122270672.930036140.-.1529979524.1529984840.85; __jdb=122270672.1.930036140|85.1529984840; shshshsID=f797fbad20f4e576e9c30d1c381ecbb1_1_1529984840145' } ret = Request(url, headers=head) res = urlopen(ret) html = res.read().decode('utf-8') print(html) html = etree.HTML(html) #定位到每一个商品标签li datas=html.xpath('//li[contains(@class,"gl-item")]') with open('JD_Phone.csv', 'a', newline='', encoding='utf-8')as f: write = csv.writer(f) for data in datas: p_price = data.xpath('div/div[@class="p-price"]/strong/i/text()') p_comment = data.xpath('div/div[5]/strong/a/text()') p_name = data.xpath('div/div[@class="p-name p-name-type-2"]/a/em') # 这个if判断用来处理那些价格可以动态切换的商品，比如上文提到的小米MIX2，他们的价格位置在属性中放了一个最低价 if len(p_price) == 0: p_price = data.xpath('div/div[@class="p-price"]/strong/@data-price') # xpath('string(.)')用来解析混夹在几个标签中的文本 write.writerow([p_name[0].xpath('string(.)'), p_price[0], p_comment[0]]) f.close() def crow_last(n): # 获取当前的Unix时间戳，并且保留小数点后5位 a = time.time() b = '%.5f' % a url = 'https://search.jd.com/s_new.php?keyword=%E6%89%8B%E6%9C%BA&enc=utf-8&qrst=1&rt=1&stop=1&vt=2&wq=%E6%89%8B%E6%9C%BA&cid2=653&cid3=655&page=' + str( 2 * n) + '&s=' + str(48 * n - 20) + '&scrolling=y&log_id=' + str(b) head = {'authority': 'search.jd.com', 'method': 'GET', 'path': '/s_new.php?keyword=%E6%89%8B%E6%9C%BA&enc=utf-8&qrst=1&rt=1&stop=1&vt=2&wq=%E6%89%8B%E6%9C%BA', 'scheme': 'https', 'referer': 'https://search.jd.com/Search?keyword=%E6%89%8B%E6%9C%BA&enc=utf-8&qrst=1&rt=1&stop=1&vt=2&wq=%E6%89%8B%E6%9C%BA&cid2=653&cid3=655&page=3&s=58&click=0', 'user-agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36', 'x-requested-with': 'XMLHttpRequest', 'Cookie': 'qrsc=3; pinId=RAGa4xMoVrs; xtest=1210.cf6b6759; ipLocation=%u5E7F%u4E1C; _jrda=5; TrackID=1aUdbc9HHS2MdEzabuYEyED1iDJaLWwBAfGBfyIHJZCLWKfWaB_KHKIMX9Vj9_2wUakxuSLAO9AFtB2U0SsAD-mXIh5rIfuDiSHSNhZcsJvg; shshshfpa=17943c91-d534-104f-a035-6e1719740bb6-1525571955; shshshfpb=2f200f7c5265e4af999b95b20d90e6618559f7251020a80ea1aee61500; cn=0; 3AB9D23F7A4B3C9B=QFOFIDQSIC7TZDQ7U4RPNYNFQN7S26SFCQQGTC3YU5UZQJZUBNPEXMX7O3R7SIRBTTJ72AXC4S3IJ46ESBLTNHD37U; ipLoc-djd=19-1607-3638-3638.608841570; __jdu=930036140; user-key=31a7628c-a9b2-44b0-8147-f10a9e597d6f; areaId=19; __jdv=122270672|direct|-|none|-|1529893590075; PCSYCityID=25; mt_xid=V2_52007VwsQU1xaVVoaSClUA2YLEAdbWk5YSk9MQAA0BBZOVQ0ADwNLGlUAZwQXVQpaAlkvShhcDHsCFU5eXENaGkIZWg5nAyJQbVhiWR9BGlUNZwoWYl1dVF0%3D; __jdc=122270672; shshshfp=72ec41b59960ea9a26956307465948f6; rkv=V0700; __jda=122270672.930036140.-.1529979524.1529984840.85; __jdb=122270672.1.930036140|85.1529984840; shshshsID=f797fbad20f4e576e9c30d1c381ecbb1_1_1529984840145' } r = requests.get(url, headers=head) r.encoding = 'utf-8' html1 = etree.HTML(r.text) datas = html1.xpath('//li[contains(@class,"gl-item")]') with open('JD_Phone.csv', 'a', newline='', encoding='utf-8')as f: write = csv.writer(f) for data in datas: p_price = data.xpath('div/div[@class="p-price"]/strong/i/text()') p_comment = data.xpath('div/div[5]/strong/a/text()') p_name = data.xpath('div/div[@class="p-name p-name-type-2"]/a/em') if len(p_price) == 0: p_price = data.xpath('div/div[@class="p-price"]/strong/@data-price') write.writerow([p_name[0].xpath('string(.)'), p_price[0], p_comment[0]]) f.close() if __name__ == '__main__': for i in range(1, 10): # 下面的print函数主要是为了方便查看当前抓到第几页了 print('***************************************************') try: print(' First_Page: ' + str(i)) crow_first(i) print(' Finish') except Exception as e: print(e) print('------------------') try: print(' Last_Page: ' + str(i)) crow_last(i) print(' Finish') except Exception as e: print(e)

                                                          

最新回复(0)