selenium captures Taobao product information

Taobao pages use a lot of js to load data, so it is easier to use selenium to crawl. As a testing tool, selenum is mainly used with the windowless browser phantomjs. This article mainly shares an example of using selenium to capture Taobao product information. It has a good reference value and I hope it will be helpful to everyone. Let’s follow the editor to take a look, I hope it can help everyone.

import re
from selenium import webdriver
from selenium.common.exceptions import TimeoutException
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from pyquery import PyQuery as pq
'''
wait.until()语句是selenum里面的显示等待，wait是一个WebDriverWait对象，它设置了等待时间，如果页面在等待时间内
没有在 DOM中找到元素，将继续等待，超出设定时间后则抛出找不到元素的异常,也可以说程序每隔xx秒看一眼，如果条件
成立了，则执行下一步，否则继续等待，直到超过设置的最长时间，然后抛出TimeoutException
1.presence_of_element_located 元素加载出，传入定位元组，如(By.ID, 'p')
2.element_to_be_clickable 元素可点击
3.text_to_be_present_in_element 某个元素文本包含某文字
'''
# 定义一个无界面的浏览器
browser = webdriver.PhantomJS(
 service_args=[
  '--load-images=false',
  '--disk-cache=true'])
# 10s无响应就down掉
wait = WebDriverWait(browser, 10)
#虽然无界面但是必须要定义窗口
browser.set_window_size(1400, 900)

def search():
 '''
 此函数的作用为完成首页点击搜索的功能，替换标签可用于其他网页使用
 :return:
 '''
 print('正在搜索')
 try:
  #访问页面
  browser.get('https://www.taobao.com')
  # 选择到淘宝首页的输入框
  input = wait.until(
   EC.presence_of_element_located((By.CSS_SELECTOR, '#q'))
  )
  #搜索的那个按钮
  submit = wait.until(EC.element_to_be_clickable(
   (By.CSS_SELECTOR, '#J_TSearchForm > p.search-button > button')))
  #send_key作为写到input的内容
  input.send_keys('面条')
  #执行点击搜索的操作
  submit.click()
  #查看到当前的页码一共是多少页
  total = wait.until(EC.presence_of_element_located(
   (By.CSS_SELECTOR, '#mainsrp-pager > p > p > p > p.total')))
  #获取所有的商品
  get_products()
  #返回总页数
  return total.text
 except TimeoutException:
  return search()

def next_page(page_number):
 '''
 翻页函数，
 :param page_number:
 :return:
 '''
 print('正在翻页', page_number)
 try:
  #这个是我们跳转页的输入框
  input = wait.until(EC.presence_of_element_located(
   (By.CSS_SELECTOR, '#mainsrp-pager > p > p > p > p.form > input')))
  #跳转时的确定按钮
  submit = wait.until(
   EC.element_to_be_clickable(
    (By.CSS_SELECTOR,
     '#mainsrp-pager > p > p > p > p.form > span.J_Submit')))
  #清除里面的数字
  input.clear()
  #重新输入数字
  input.send_keys(page_number)
  #选择并点击
  submit.click()
  #判断当前页是不是我们要现实的页
  wait.until(
   EC.text_to_be_present_in_element(
    (By.CSS_SELECTOR,
     '#mainsrp-pager > p > p > p > ul > li.item.active > span'),
    str(page_number)))
  #调用函数获取商品信息
  get_products()
 #捕捉超时，重新进入翻页的函数
 except TimeoutException:
  next_page(page_number)

def get_products():
 '''
 搜到页面信息在此函数在爬取我们需要的信息
 :return:
 '''
 #每一个商品标签，这里是加载出来以后才会拿网页源代码
 wait.until(EC.presence_of_element_located(
  (By.CSS_SELECTOR, '#mainsrp-itemlist .items .item')))
 #这里拿到的是整个网页源代码
 html = browser.page_source
 #pq解析网页源代码
 doc = pq(html)
 items = doc('#mainsrp-itemlist .items .item').items()
 for item in items:
  # print(item)
  product = {
   'image': item.find('.pic .img').attr('src'),
   'price': item.find('.price').text(),
   'deal': item.find('.deal-cnt').text()[:-3],
   'title': item.find('.title').text(),
   'shop': item.find('.shop').text(),
   'location': item.find('.location').text()
  }
  print(product)

def main():
 try:
  #第一步搜索
  total = search()
  #int类型刚才找到的总页数标签，作为跳出循环的条件
  total = int(re.compile('(\d+)').search(total).group(1))
  #只要后面还有就继续爬，继续翻页
  for i in range(2, total + 1):
   next_page(i)
 except Exception:
  print('出错啦')
 finally:
  #关闭浏览器
  browser.close()

if __name__ == '__main__':
 main()

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