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                            `requests`庫提供了一個`session`類，來實現客戶端與服務器的會話保持。
```python
# 實例化一個session對象
session  = requests.session()
# 讓session發送get或post請求
response = session.get(url, headers)
response = session.post(url, headers)
```
<br/>

案例：登錄人人網
```python
import requests

post_url = 'http://www.renren.com/PLogin.do'
header = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.75 Safari/537.36'
}

# 1. 賬號和密碼
post_data = {
    'email': '123456@qq.com',
    'password': '123456'
}

# 2. 獲取session對象
session = requests.session()

# 3. 請求成功后，cookie會自動保存在session中
session.post(post_url, data=post_data, headers=header)

# 4. 請求登陸之后的頁面
response = session.get('http://www.renren.com/474133869/profile', headers=header)

with open('renren.html', 'w', encoding='utf-8') as f:
    f.write(response.text)
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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