【网络爬虫】python+selenium+edge

声明：

借鉴了其他博主的写法，但是基于本案例的需求修改了相当大部分，也优化了部分模块（数据存储模块），感谢大家的分享，让我可以站在巨人的肩膀上。遇到问题请在评论区留言。

工程结构如下：

第一个文件是爬虫程序，第二个csv格式文件是存放数据的文件

 main.py内容如下：

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
import re
import time

import csv
key_word = '电动车充电器' #搜索关键字
data=[]     #存放爬到的数据
browser = webdriver.Edge(r'C:edgedriver_win64msedgedriver.exe' )	#添加浏览器的driver的路径


def search(key_word):
    try:
        browser.get('https://www.jd.com/')
        # 输入框加载完成
        input = WebDriverWait(browser,10).until(
            EC.presence_of_element_located((By.CSS_SELECTOR,'#key'))
        )
        # 搜索按钮加载完成
        submit = WebDriverWait(browser,10).until(
            EC.element_to_be_clickable((By.CSS_SELECTOR,'#search > div > div.form > button'))
        )
        input.send_keys(key_word)
        submit.click()
        # 获取一共有多少页结果
        total_page = WebDriverWait(browser,10).until(
            EC.presence_of_element_located((By.CSS_SELECTOR,'#J_bottomPage > span.p-skip > em:nth-child(1) > b'))
        )


        # 打印一共有多少页结果
        return total_page.text
    except TimeoutError:
        # 出现错误，重新请求一次
        return search()

def next_page(page_num):
    try:
        print('跳转到: 第', page_num,'页')
        # 输入框加载完成
        input = WebDriverWait(browser, 10).until(
            EC.presence_of_element_located((By.CSS_SELECTOR, '#J_bottomPage > span.p-num > a.pn-next'))
        )
        # 搜索按钮加载完成
        submit = WebDriverWait(browser, 10).until(
            EC.element_to_be_clickable((By.CSS_SELECTOR, '#J_bottomPage > span.p-num > a.pn-next'))
        )
        submit.click()
        time.sleep(1)
        finish_load =WebDriverWait(browser,10).until(
        EC.presence_of_element_located((By.CLASS_NAME,'gl-item'))
    )
        if finish_load:
            print('第 ',page_num,' 页加载完成')
            get_products(page_num)
    except TimeoutError:
        next_page(page_num)

def get_products(page_num):
    if page_num == 10:
        save_to_mongo()
    print('开始采集第 ',page_num,' 页信息')
    WebDriverWait(browser,10).until(
        EC.presence_of_element_located((By.CLASS_NAME,'gl-item'))
    )
    # html = browser.page_source
    # doc = pq(html)
    items = browser.find_elements_by_class_name('gl-item')
    index = 0
    print("第",page_num,"页有", len(items),"条数据")
    for item in items:
        product={'title': 0,'price': 0,'shop': 0}
        try:
            product['price']=item.find_element_by_css_selector('.p-price strong').text.replace('n', '')

        except:
            print("元素缺失")
        try:
            product['title']=item.find_element_by_css_selector('.p-name em').text.replace('n', '')
        except:
            print("元素缺失")
        try:
            product['shop']=item.find_element_by_css_selector('.p-shop span').text.replace('n', '')
        except:
            print("元素缺失")
        data.append(product.values())
        # print(product)

        index = index + 1


def save_to_mongo():

    csv_file = open('pac_c.csv', 'w',newline='')

    csv_writer = csv.writer(csv_file)
    # 4.3 写入内容
    csv_writer.writerows(data)

    # 5.关闭文件
    csv_file.close()
    print('保存成功')

def main(key_word):
    try:
        print('开始采集 ',key_word,' 信息')
        total_page = search(key_word)
        total_page = int(re.compile('.*?(d+).*?').search(total_page).group(1))
        print('一共有',total_page,'页数据')
        get_products(1)
        for i in range(2,total_page+1):
            next_page(i)
    except TimeoutError:
        print('error')
    finally:
        browser.close()

if __name__ == '__main__':
    main(key_word)