饮冰三年-人工智能-Python-37 爬虫之初窥门径

网络爬虫（又被称为网页蜘蛛，网络机器人，在FOAF社区中间，更经常的称为网页追逐者），是一种按照一定的规则，自动地抓取万维网信息的程序或者脚本

示例一：很早之前，用C#通过正则表达式写过一个小功能，就是获取自己写过的博客的数量以及标题和书写时间，现在我们用python来再次实现这个这个功能

https://www.cnblogs.com/YK2012/p/6722402.html

import requests
from bs4 import BeautifulSoup

for i in range(1,20):

    response = requests.get(url='http://www.cnblogs.com/YK2012/default.html?page='+str(i))
    response.encoding = response.apparent_encoding

    soup = BeautifulSoup(response.text,features="html.parser")
    target = soup.find_all(name='div', attrs={"class":'day'})
    for entity in target:
        title = entity.find('a','postTitle2')
        desc = entity.find('div', 'postDesc')
        print(title.text.strip(),desc.text[10:27])

短短数十行代码即可实现

中心思想：拿到网址，get请求，分析数据

示例二：自动登录GitHub，并获取项目信息

import requests
from bs4 import BeautifulSoup
import lxml
from bs4.element import Tag

# 1：访问登录页面，获取authenticity_token
i1 = requests.get("https://github.com/login")
soup1 = BeautifulSoup(i1.text, features='lxml')
token = soup1.find(name='input', attrs={'name': 'authenticity_token'})
authenticity_token = token.get('value')
ga_id = soup1.find(attrs={'name': 'octolytics-dimension-ga_id'})
c1 = i1.cookies.get_dict()
i1.close()
# print('令牌', authenticity_token)
print(c1)

# 2 拿掉令牌和用户名密码，发送用户验证
form_data = {
    "authenticity_token": authenticity_token,
    "utf8": "",
    "commit": "Sign in",
    "login": "[email protected]",
    'password': '90opl;./()OPL:>?',
    'ga_id': '470285644.1573810874',
    'webauthn-support': ' supported',
    'webauthn-iuvpaa-support': ' unsupported',
    'required_field_3d5b': '',
    'timestamp': '1573811914069',
    'timestamp_secret': '2787f62a778139ef3be7fdea96b5f867e9e08b8976ecc07bb4869748d930cabd'
}
i2 = requests.post('https://github.com/session', data=form_data, cookies=c1)
c2 = i2.cookies.get_dict()
c1.update(c2)
print('如果不出意外，这样就登录成功了！')

i3 = requests.get('https://github.com/settings/repositories', cookies=c1)
soup3 = BeautifulSoup(i3.text, features='lxml')
list_group = soup3.find(name='div', class_='js-collaborated-repos')

for child in list_group.children:
    if isinstance(child, Tag):
        project_tag = child.find(name='a', class_='mr-1')
        size_tag = child.find(name='span',class_='text-small')
        temp = "项目:%s(%s); 项目路径:%s" % (project_tag.get('href'), size_tag.get_text().strip()[0:8].strip(), project_tag.string, )
        print(temp)

GitHub

GitHub的小心机：登录的时候需要传递令牌。

饮冰三年-人工智能-Python-37 爬虫之初窥门径

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