Python之网页爬虫request模块

#########网页爬虫#########

 

 

 

## requests模块

 

- 对requests模块的理解

        http/1.1请求的封装, 可以轻松实现cookie， IP代理， 登陆验证等操作;

        Requests 使用的是 urllib3，因此继承了它的所有特性。Requests 支持 HTTP 连接保持和连接池，支持使用 cookie 保持会话，支持文件上传，支持自动确定响应内容的编码，支持国际化的 URL 和 POST 数据自动编码。现代、国际化、人性化。

 

- 对requests模块的使用 get方法

import requests

url = 'http://www.baidu.com'
# 使用get方法来获取或url地址
response = requests.get(url)
print(response)
print(response.status_code)
print(response.cookies)
print(response.text)
print(type(response.text))

 

import requests

"""
def post(url, data=None, json=None, **kwargs):
    Sends a POST request.

    :param url: URL for the new :class:`Request` object.
    :param data: (optional) Dictionary (will be form-encoded), bytes, or file-like object to send in the body of the :class:`Request`.
    :param json: (optional) json data to send in the body of the :class:`Request`.
    :param \*\*kwargs: Optional arguments that ``request`` takes.
    :return: :class:`Response ` object
    :rtype: requests.Response
    

    return request('post', url, data=data, json=json, **kwargs)
"""
response = requests.post('http://httpbin.org/post', data={'name': 'kobe', 'age': 40})
print(response.text)
response1 = requests.delete('http://httpbin.org/post', data={'name': 'kobe'})
print(response1.text)

 

## 带参数的get请求

import requests

# url1 = 'https://movie.douban.com/subject/4864908/comments?start=20&limit=20&sort=new_score&status=P'
data = {
    'start': 40,
    'limit': 80,
    'sort': 'new_score',
    'status': 'P',
}
url = 'https://movie.douban.com/subject/4864908/comments'
response = requests.get(url, params=data)
print(response.url)

 

## 解析json格式

ip = '8.8.8.8'
url = "http://ip.taobao.com/service/getIpInfo.php?ip=%s" %(ip)
response = requests.get(url)
content = response.json()
print(content)
print(type(content))

 

## 获取二进制数据

值得注意的是：

# response.text ： 返回字符串的页面信息
# response.content ： 返回bytes的页面信息

# 获取二进制数据
url = 'https://gss0.bdstatic.com/-4o3dSag_xI4khGkpoWK1HF6hhy/baike/w%3D268%3Bg%3D0/sign=4f7bf38ac3fc1e17fdbf8b3772ab913e/d4628535e5dde7119c3d076aabefce1b9c1661ba.jpg'
response = requests.get(url)
# print(response.text)
with open('picture.png', 'wb') as f:
    f.write(response.content)

 

## 下载视频

# 下载视频

url = "http://gslb.miaopai.com/stream/sJvqGN6gdTP-sWKjALzuItr7mWMiva-zduKwuw__.mp4"
response = requests.get(url)
with open('/tmp/learn.mp4', 'wb') as f:
    # response.text ： 返回字符串的页面信息
    # response.content ： 返回bytes的页面信息
    f.write(response.content)

 

 

## 添加headers信息

# 添加header信息

url = 'http://www.cbrc.gov.cn/chinese/jrjg/index.html'
user_agent = "Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0"
headers = {
    'User-Agent': user_agent
}
response = requests.get(url,headers=headers)
print(response.status_code)

- 状态码的判断
response = requests.get(url, headers=headers)
exit() if response.status_code != 200 else print("请求成功)

 

 

## 高级设置_上传文件

# 上传文件
data = {'file': open('picture.png', 'rb')}
response = requests.post('http://httpbin.org/post', files=data)
print(response.text)

 

## 获取cookie信息

# 获取cookie信息
response  = requests.get('http://www.csdn.net')
print(response.cookies)
for key,value in response.cookies.items():
    print(key + ':' +value)

 

## 读取已经存在的cookie信息访问网址内容(会话维持)

## 读取已经存在的cookie信息访问网址内容(会话维持)
# 设置一个cookie： name = houzeyu
s = requests.session()
response1 = s.get('http://httpbin.org/cookies/set/name/houzeyu')
response2 = s.get('http://httpbin.org/cookies')
print(response2.text)

 

 

## 忽略证书验证

# 忽略证书验证
url = 'https://www.12306.cn'
response = requests.get(url, verify=False)
print(response.status_code)
print(response.text)

 

## 代理设置/设置超时间

proxy = {
    'https': '171.221.239.11:808',
    'http': '218.14.115.211:3128'
}
response = requests.get('http://httpbin.org/get', proxies=proxy, timeout=10)
print(response.text)

 

 

 

 

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