selenium爬取淘宝美食信息之爬虫篇
GitHub：https://github.com/why19970628/Python_Crawler/tree/master/taobao
通过观看崔庆才版的Python3爬虫入门到精通课程之后，对selenium（四六木）的认识面又扩大了，正好隔壁桌的周工也刚爬了淘宝，顿时也来了好奇心。本次爬取了淘宝网页上能显示的100页的数据，大约4400个左右，速度也不慢。技术总结如下：
1.正常请求
- 通过requests方法请求的页面源码中没有信息
- 封装好请求头，加载response里面的信息为横向字符串，加了json也没用，以后可以好好研究这件事
2. selenium请求
2.1 导入必要参数
from selenium import webdriver
import re
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
import time
from lxml import etree
from time import sleep
import random
#from pyquery import PyQuery as pq
from selenium.webdriver.support import expected_conditions as EC
chrome_driver = r"D:\ProgramData\Anaconda3\Lib\site-packages\selenium\webdriver\chrome\chromedriver.exe"
browser = webdriver.Chrome(executable_path=chrome_driver)
wait=WebDriverWait(browser,3)
2.2 搜索“美食”页面返回信息，由微博登录
def search():
browser.get('https://www.taobao.com')
#sleep(5)
#input = wait.until(EC.presence_of_all_elements_located((By.CSS_SELECTOR,'#q')))
#submit=wait.until(EC.element_to_be_clickable(By.CSS_SELECTOR,"#J_TSearchForm > div.search-button"))
browser.find_element_by_name('q').send_keys('美食')
sleep(2)
browser.find_element_by_xpath('//*[@id="J_TSearchForm"]/div[1]/button').click() ##搜索按钮
browser.find_element_by_xpath('//*[@class="forget-pwd J_Quick2Static"]').click() #点击密码登录
sleep(3)
#browser.find_element_by_name('weibo-login').click()
browser.find_element_by_xpath('//*[@id="J_OtherLogin"]/a[1]').click() #点击微博登录
sleep(3)
browser.find_element_by_name('username').send_keys('淘宝绑定的微博号')
browser.find_element_by_name('password').send_keys('微博密码')
#a=input('请输入验证码:',) #如果有验证码，注释去掉
#browser.find_element_by_name('verifycode').send_keys(a)
browser.find_element_by_xpath('//*[@id="pl_login_logged"]/div/div[7]/div[1]/a').click()
sleep(2)
#browser.find_element_by_xpath('//*[@id="J_SearchForm"]/button').click() ##搜索
#sleep(3)
total=browser.find_element_by_xpath('//*[@id="mainsrp-pager"]/div/div/div/div[1]')
print(total.text)
sleep(3)
get_products(1)
return total.text
2.3 连接数据库与爬取网页内容
在使用find_elements_by_xpath方法返回的数据，我的竟然不能直接遍历出来，而是要添加到空列表里边进行遍历。晕~
def database():
coon = pymysql.connect(
host='localhost', user='root', passwd='',
port=3306, db='taobao', charset='utf8'
)
cur = coon.cursor() # 建立游标
return cur, coon
def get_products(page):
price = browser.find_elements_by_xpath('//div[@class="price g_price g_price-highlight"]/strong')
title = browser.find_elements_by_xpath('//*[@id="mainsrp-itemlist"]/div/div/div[1]/div/div[2]/div[2]/a')
place = browser.find_elements_by_xpath('//div[@class="row row-3 g-clearfix"]/div[2]')
buy_num = browser.find_elements_by_xpath('//div[@class="row row-1 g-clearfix"]/div[2]')
shop=browser.find_elements_by_xpath('//div[@class="shop"]/a/span[2]')
print('第', page, '页,共有---', len(price), '个数据')
prices = []
for i in price:
try:
price1 = i.text
except:
price1 == None
prices.append(price1)
print(prices)
titles=[]
for i in title:
try:
title1 = i.text
except:
title1==None
titles.append(title1)
print(titles)
places = []
for i in place:
try:
place1 = i.text
except:
price1 == None
places.append(place1)
print(places)
buy_nums = []
for i in buy_num:
try:
buy_num1 = i.text
except:
buy_num1 == None
buy_nums.append(buy_num1)
print(buy_nums)
shops = []
for i in shop:
try:
shop1 = i.text
except:
shop1 == None
shops.append(shop1)
print(shops)
cur,coon=database()
for i in range(len(price)):
try:
shop=shops[i]
buy_num=buy_nums[i]
price=prices[i]
title=titles[i]
place=places[i]
ss = (str(shop),str(title), str(price), str(place), str(buy_num))
print(ss)
sql = "insert into taobao_food(shop,title,price,place,buy_num) VALUE('%s','%s','%s','%s','%s')" % ss
cur.execute(sql)
except:
pass
coon.commit()
print('------------------------------页数-------------------------------------')
2.4 翻页
通过淘宝的高亮的页数与翻页数利用 EC.text_to_be_present_in_element 函数作对比，实现翻页准确
def next_page(page_number):
try:
input=browser.find_element_by_xpath('//*[@id="mainsrp-pager"]/div/div/div/div[2]/input')#填写页数
submit=browser.find_element_by_xpath('//*[@id="mainsrp-pager"]/div/div/div/div[2]/span[3]')#确定键
input.clear()
input.send_keys(page_number)
submit.click()
print('第' + str(page_number) + '页正在翻------------')
#print(browser.find_element_by_css_selector('#mainsrp-pager > div > div > div > ul > li.item.active > span'))
wait.until(EC.text_to_be_present_in_element((By.CSS_SELECTOR,'#mainsrp-pager > div > div > div > ul > li.item.active > span'),str(page_number)))
get_products(page_number)
except TimeoutError:
next_page(page_number)
def main():
total=search()
time.sleep(random.uniform(8, 0))
total=int(re.compile('(\d+)').search(total).group(1))
#print(total)
for i in range(2,total+1):
next_page(i)
time.sleep(random.uniform(8, 10))
爬取的页数信息：
数据库：
数据清洗与分析篇：https://blog.csdn.net/weixin_43746433/article/details/97688169