Python爬虫基本库request的基本使用

Table of Contents

request

用urllib去处理网页验证和Cookies时，需要写Opener和Handler来处理，很不方便，这里我们学习更为强大的库request

get()

实例：

import requests #导入requests
html = requests.get('https://www.csdn.net/')#使用get方法获取页面信息
print(html.text)#调取text属性查看页面代码

添加参数使用param+字典

import requests  # 导入requests
data = {
    'jl': '765',
    'kw': 'python',
    'kt': '3'
}
html = requests.get('https://sou.zhaopin.com/',params=data)  # 添加参数
print(html.text)  # 调取text属性查看页面代码

添加headers使用headers+字典

import requests  # 导入requests
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36'
}
data = {
    'jl': '765',
    'kw': 'python',
    'kt': '3'
}
html = requests.get('https://sou.zhaopin.com/',headers=headers,params=data)  # 添加参数
print(html.text)  # 调取text属性查看页面代码

高级用法

cookies设置，代理设置等

Cookies

获取cookies:

import requests  # 导入requests
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36'
}
data = {
    'jl': '765',
    'kw': 'python',
    'kt': '3'
}
html = requests.get('https://blog.csdn.net/qq_40966461/article/details/104974998',headers=headers,params=data)  # 添加参数
print(html.cookies)  # 调取text属性查看页面代码
for key,value in html.cookies.items():
    print(key+'='+value)

很简单，直接获取cookies属性即可

维持会话Session()

在requests中，如果直接利用get()或post()等方法可以做到模拟网页的请求，但是这实际上时相当于不同的会话，相当于用了两个浏览器打开了不同的页面，这时需要用session对象来维护对话

import requests  # 导入requests
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36'
}
data = {
    'jl': '765',
    'kw': 'python',
    'kt': '3'
}
html = requests.Session().get('https://blog.csdn.net/qq_40966461/article/details/104974998',headers=headers,params=data)  # 添加参数
print(html.cookies)  # 调取text属性查看页面代码
for key,value in html.cookies.items():
    print(key+'='+value)

调用requests模块中get方法时先创建一个Session对象

SSL证书验证

import requests  # 导入requests
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36'
}
response  = requests.get('http://www.12306.cn',headers=headers,verify = False)
print(response.status_code)

verify=False即可

代理设置

import requests  # 导入requests
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36'
}
proxies = {
    "http":"http://183.166.132.176",
    "https":"https://183.166.132.176"
}
response  = requests.get('http://www.12306.cn',headers=headers,proxies=proxies,verify = False)
print(response.status_code)

添加proxies即可，代理可以搜索快代理

超时设置

加参数timeout= 1

身份认证

get中添加参数 auth=(‘username’,‘password’)

OAuth认证方式

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