用selenium 自动爬取某一本小说章节及其内容，并存入数据库中

 from selenium import webdriver
 import pymysql
 from selenium.webdriver.support.ui import WebDriverWait     # 等待
 from selenium.webdriver.support import expected_conditions as ec # 等待条件
 from selenium.webdriver.common.by import By
 import html
 import _thread
 from selenium.webdriver.chrome.options import Options
 
 def ceil(x, y):
     if x % y == 0:              # 相除后为整数
         return int(x / y)
     else:                       # 相除有小数
         return int(x / y) + 1
 
 # 创建一个浏览器
 chrome_options = Options()
 chrome_options.add_argument('--headless')
 dr = webdriver.Chrome(chrome_options=chrome_options)
 
 # 设置访问的网站
 dr.get('https://doupocangqiong1.com/1/list_piaotian/')
 
 # 获取所有的a标签
 a = dr.find_elements_by_css_selector('.dirlist > li > a')
 
 # 连接数据库
 db = pymysql.connect("localhost", "root", "root", "selenium", charset='utf8')
 # 获取游标
 cursor = db.cursor()
 
 for i in a:
     name = i.text
     href = i.get_attribute('href')
     sql = "INSERT INTO novel (name,href,content) VALUES ('%s','%s','%s')"%(name,href,'')
     cursor.execute(sql)         # 使用execute方法执行SQL语句
     db.commit()
 dr.close()          # 关闭浏览器
 
 def line(lineName, start, count):
     dr = webdriver.Chrome(chrome_options=chrome_options)         # 创建一个浏览器
     # 连接数据库
     db = pymysql.connect("localhost", "root", "root", "selenium", charset='utf8')
     # 获取游标
     cursor = db.cursor()
 
     sql = "SELECT id,href FROM novel LIMIT %s, %s"%(start, count)
     cursor.execute(sql)  # 使用execute方法执行SQL语句
     data = cursor.fetchall()  # 使用 fetchall() 方法获取所有数据
     for i in data:
         dr.get(i[1])
         # 放置等待
         WebDriverWait(dr, 5, 0.1).until_not(ec.text_to_be_present_in_element((By.CSS_SELECTOR, '#chaptercontent'),
                                                                             U'正在转码，请稍后......'))  # 等待dr浏览器10秒钟，每0.1秒钟问一次
         content = html.escape(dr.find_element_by_css_selector('#chaptercontent').text)
         # escape()将特殊字符转为特殊的编码格式，unescape()将编码格式转回特殊字符
         sql = "UPDATE novel SET content = '%s' WHERE id = %s" % (content, i[0])
         cursor.execute(sql)  # 使用execute方法执行SQL语句
         db.commit()
         print(lineName, '完成了', i[0], '的采集')
     dr.close()          # 关闭窗口
     dr.quit()           # 关闭浏览器
     cursor.close()
     db.close()
     print(lineName, '完成了采集')
 
 def productLine(func, total, lineCount):
     every = ceil(total[0][0], lineCount)
     print('every', every)
     for i in range(lineCount):
         print('-------------', i)
         print(_thread.start_new_thread(func, ('line-' + str(i) + '', i * every, every)))
 
 try:
     sql = 'SELECT COUNT(*) FROM novel'
     cursor.execute(sql)  # 使用execute方法执行SQL语句
     total = cursor.fetchall()  # 使用 fetchall() 方法获取所有数据
     print(total)
 
     productLine(line, total, 5)
 
 except:
     print ("Error: unable to start thread")
 
 while 1:
    pass