#知乎推荐文章爬取

#2017/8/6

# -*- encoding = utf-8 -*-

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 selenium.common.exceptions import TimeoutException

from selenium.common.exceptions import NoSuchElementException

from bs4 import BeautifulSoup

import csv

import os

import time

import re

driver = webdriver.Chrome()

#登录知乎

def putcookies(account,password):

try:

driver.get('https://www.zhihu.com/#signin')

WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.CSS_SELECTOR, "body > div.index-main > div > div.desk-front.sign-flow.clearfix.sign-flow-simple > div.index-tab-navs > div > a.active")))

botton = driver.find_element_by_css_selector('body > div.index-main > div > div.desk-front.sign-flow.clearfix.sign-flow-simple > div.view.view-signin > div.qrcode-signin-container > div.qrcode-signin-step1 > div.qrcode-signin-cut-button > span')

botton.click()

form = driver.find_element_by_css_selector('body > div.index-main > div > div.desk-front.sign-flow.clearfix.sign-flow-simple > div.view.view-signin > form > div.group-inputs > div.account.input-wrapper > input[type="text"]')

pas = driver.find_element_by_css_selector('body > div.index-main > div > div.desk-front.sign-flow.clearfix.sign-flow-simple > div.view.view-signin > form > div.group-inputs > div.verification.input-wrapper > input[type="password"]')

sub = driver.find_element_by_css_selector('body > div.index-main > div > div.desk-front.sign-flow.clearfix.sign-flow-simple > div.view.view-signin > form > div.button-wrapper.command > button')

form.send_keys(account)

pas.send_keys(password)

sub.click()

try:

print('请手动输入验证码')

driver.implicitly_wait(10)

driver.find_element_by_css_selector('#root > div > div:nth-child(2) > header > div > div.SearchBar > button')

except NoSuchElementException:

sub.click()

except:

putcookies(account,password)

#滑动页面

def change_page(num):

WebDriverWait(driver,10).until(EC.presence_of_element_located((By.CSS_SELECTOR,'#root > div > div:nth-child(2) > header > div > div.SearchBar > button')))

for i in range(num):

driver.execute_script('window.scrollTo(0, document.body.scrollHeight)')

time.sleep(3)

#解析页面

def findinf(html):

soup = BeautifulSoup(html,'lxml')

r = re.compile('(\d+)')

links = soup.find_all('div',class_='Card TopstoryItem')

for link in links:

try:

maininf = link.find(class_='Feed-meta-item').get_text()[-3:]#话题

writer = link.find(class_='AuthorInfo-head').get_text()#作者

except:

continue

try:

intd = link.find('div',class_='RichText AuthorInfo-badgeText').string#作者个人介绍

except:

intd = ''

title = link.find('h2',class_='ContentItem-title').get_text()#标题

href = 'https://www.zhihu.com' + link.find('h2',class_='ContentItem-title').a['href']#文章链接

try:

support = link.find(class_='Button VoteButton VoteButton--up').get_text()#点赞

except:

support = link.find(class_='Button LikeButton ContentItem-action').get_text()#点赞

try:

talking = r.match(link.find('button',class_='Button ContentItem-action Button--plain').get_text()[:-3]).group()#评论数

except:

talking = ''

content = link.find('span',class_='RichText CopyrightRichText-richText').get_text()#摘要

yield {

'maininf': maininf,

'writer':writer,

'intd':intd,

'title':title,

'support':support,

'talking':talking,

'content':content,

'href':href,

}

#创建一个文件夹

def make(path):

if not os.path.exists(path):

os.makedirs(path)

#保存数据

def save_to_csv(inf,path):

with open(path + '知乎文章信息概要采集.csv','a') as f:

writer = csv.writer(f)

writer.writerow(['标题','作者','话题','作者个人介绍','点赞数','评论数','文章链接','摘要'])

try:

for i in inf:

writer.writerow([i['title'],i['writer'],i['maininf'],i['intd'],i['support'],i['talking'],i['href'],i['content']])

except:

pass

#主函数

def main(account,password,num):

path = 'D:/数据/知乎文章/'

putcookies(account,password)

change_page(num)

inf = findinf(driver.page_source)

make(path)

print('---'*43)

print('{:^60}'.format('知乎文章概要'))

print("***"*43)

for i in findinf(driver.page_source):

print('标题:{:<10s}'.format(i['title']))

print('作者:{:>3s}'.format(i['writer']),end = ' '*5)

print("话题:{:>3s}".format(i['maininf']))

print('作者个人介绍:')

print('{:<5s}'.format(i['intd']))

print('点赞数:{:<2s}'.format(i['support']),end = ' '*5)

print("评论数:{:3s}".format(i['talking']))

print("文章链接:" + i['href'])

print("摘要：")

print('{:<5s}'.format(i['content']))

print('---' *43)

save_to_csv(inf,path)

#执行程序

if __name__ == '__main__':

num = int(input('请输入要爬取的页面数：'))

account = input("请输入知乎账号：")

password = input("请输入知乎密码：")

time_start = time.time()

main(account,password,num)

print("^^^"*43)

print("共耗时{}秒".format(time.time()-time_start))

driver.quit()