自动化测试工具selenium的使用

教材参考：《Python 3网络爬虫开发实战》崔庆才。需要资料的同学评论私聊获取。

用selenium获取淘宝美食信息

这里写图片描述

搜索美食信息

import re
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from config import *
from  pyquery import PyQuery as pq
import pymongo
import time

client = pymongo.MongoClient(MONGO_URL)
db = client[MONGO_DB]

browser = webdriver.Chrome()
wait = WebDriverWait(browser,10)


def search():
    try:
        browser.get('https://www.taobao.com')
        input = wait.until(EC.presence_of_element_located((By.CSS_SELECTOR, "#q")))
        submit = wait.until(EC.element_to_be_clickable((By.CSS_SELECTOR,'#J_TSearchForm > div.search-button > button')))
        input.clear()
        input.send_keys('美食')
        submit.click()
        total = wait.until(EC.presence_of_all_elements_located((By.CSS_SELECTOR,'#mainsrp-pager > div > div > div > div.total')))[0]
        #print(total,total.text)
        return total.text
    except TimeoutError:
        return search()

自动翻页处理

自动翻页

def next_page(page_num):`这里写代码片`
    try:
        input = wait.until(EC.presence_of_element_located((By.CSS_SELECTOR, "#mainsrp-pager > div > div > div > div.form > input")))
        submit = wait.until(EC.element_to_be_clickable((By.CSS_SELECTOR, '#mainsrp-pager > div > div > div > div.form > span.btn.J_Submit')))
        input.clear()
        input.send_keys(page_num)
        submit.click()
        wait.until(EC.text_to_be_present_in_element((By.CSS_SELECTOR,'#mainsrp-pager > div > div > div > ul > li.item.active > span'),str(page_num)))
        get_products(page_num)
    except TimeoutError:
        next_page(page_num)

获取产品信息并保存到mongodb

获取美食信息包括（商家，商品，销售量，简介，商铺名）

def get_products(page_num):
    wait.until(EC.presence_of_all_elements_located((By.CSS_SELECTOR,'#mainsrp-itemlist .items .item')))
    html = browser.page_source
    doc = pq(html)
    items = doc('#mainsrp-itemlist .items .item').items()
    for item in items:
        product = {
            'title': item.find('.title').text(),
            'image' : item.find('.pic .img').attr('data-src'),
            'price' : item.find('.price').text()[2:],
            'deal' : item.find('.deal-cnt').text()[:-3],
            'shop' : item.find('.shop').text(),
            'location' : item.find('.location').text()
        }
        save_to_mongo(product)

获取美食信息

保存到mongodb

def save_to_mongo(product):
    try:
        if db[MONGO_TABLE].insert(product):
            print('储存到mongodb成功',product)
    except Exception:
        print('储存到mongodb异常',product)
# main函数
def main():
    total = search()
    total = int(re.compile('(\d+)').search(total).group(1))
    for i in range(1,total+1):
        next_page(i)
        time.sleep(3)
# 主程序
if __name__ == '__main__':
    main()