爬虫学习笔记--爬B站评论

由于松爱协会的小伙伴邀请，我研究了一下爬取b站上协会的一些精彩评论

由于评论是动态的，所以要用到 selenium 之前的博文里已经有关于selenium的安装注意事项

还要用到Firefox的firebug  去获取xpath信息 

target = app.find_element_by_xpath(".//*[@id='recommend_report']/div[1]/span")
app.execute_script("arguments[0].scrollIntoView();", target)#定位到特定的元素
time.sleep(3)

这里注意一下 由于有些信息要 下拉滚动条才可以 获取到 那么这里有一个下拉滚动条 定位到某一元素的方法

贴上代码 

#coding=utf-8
from selenium import webdriver
import sys
import time
from selenium.webdriver.common.keys import Keys
reload(sys)
sys.setdefaultencoding("utf-8")

# fp = webdriver.PhantomJS()
# fp.set_preference("permissions.default.stylesheet",2)
# fp.set_preference("permissions.default.image",2)
app = webdriver.Firefox()
app.get("https://www.bilibili.com/video/av3553625/?from=search&seid=10292605247919873793")

target = app.find_element_by_xpath(".//*[@id='recommend_report']/div[1]/span")
app.execute_script("arguments[0].scrollIntoView();", target)#定位到特定的元素
time.sleep(3)

target2 = app.find_element_by_xpath(".//*[@id='bbComment']/div[1]/div[4]/div[4]/span/a");
app.execute_script("arguments[0].scrollIntoView();", target2)
time.sleep(3)
target2.click()
# js="var q=document.documentElement.scrollTop=100000"
# app.execute_script(js)
# time.sleep(3)

for i in range(20):
    if(i==7):
        continue
    name = app.find_element_by_xpath(".//*[@id='bbComment']/div[1]/div[4]/div["+str(i+1)+"]/div[2]/div[1]/a[1]")
    test = app.find_element_by_xpath(".//*[@id='bbComment']/div[1]/div[4]/div["+str(i+1)+"]/div[2]/p")
    if (i != 13 and i != 17):
        pinglun1 = app.find_element_by_xpath(".//*[@id='bbComment']/div[1]/div[4]/div["+str(i+1)+"]/div[2]/div[3]/div[1]/div/div[1]/span")
    if (i != 13 and i != 17):
        pinglun2 = app.find_element_by_xpath(".//*[@id='bbComment']/div[1]/div[4]/div["+str(i+1)+"]/div[2]/div[3]/div[2]/div/div[1]/span")
    if(i !=12 and i !=13 and i != 17):
        pinglun3 = app.find_element_by_xpath(".//*[@id='bbComment']/div[1]/div[4]/div["+str(i+1)+"]/div[2]/div[3]/div[3]/div/div[1]/span")
    print ("作者：")
    print (name.text.strip())
    print ("内容：")
    print test.text.strip()
    print ("后续：")
    if (i != 13 and i != 17):
        print pinglun1.text.strip()
    if (i != 13 and i != 17):
        print pinglun2.text.strip()
    if (i != 12 and i != 13 and i != 17):
        print pinglun3.text.strip()
    print ("\n")
    time.sleep(3)
#
# tests = app.find_elements_by_css_selector("p.text")
# for i in range(len(tests)):
#     test = tests[i].text.strip()
#     print test
app.quit()

这里只抓取了一页的评论 还可以再完善抓更多页面