pip install beautifulsoup4: Python library installation

Hands-on with the beautifulsoup4 library

When people use Python to do web data capture, nine times out of ten will encounter the problem of installing libraries. Today, we will take the installation of beautifulsoup4, a commonly used library to talk about the doorway. The most straightforward installation command looks like this:

pip install beautifulsoup4

However, there is a pit here to pay attention to, some companies will limit the network environment pip download. At this time we should offer our masterpiece - proxy IP method. For example, assuming you are using ipipgo's proxy service, you can do this when installing:

pip install --proxy=http://用户名:密码@ipipgo proxy address:port beautifulsoup4

Why do I need a proxy IP to load the library?

Here we have to harp on the wonders of proxy IPs. Many newbies don't realize that if you get rejected frequently when installing Python libraries, it's likely that your current IP has been temporarily blacked out. Especially in the company's intranet or school server room such as a shared network, it is possible that someone just installed the library before the foot, after the foot you can not be installed.

This time with ipipgo's exclusive IP is particularly fragrant, equivalent to pip downloads open VIP channel. See this comparison table for specific benefits:

Practical cases to go a wave

Assuming that you want to capture the price data of an e-commerce site, remember to add the proxy settings in the complete code. Here use ipipgo's rotate IP function to demonstrate:

import requests
from bs4 import BeautifulSoup

proxies = {
    'http': 'http://user123:pass456@rotate.ipipgo.com:9020',
    'https': 'http://user123:pass456@rotate.ipipgo.com:9020'
}

response = requests.get('destination URL', proxies=proxies)
soup = BeautifulSoup(response.text, 'html.parser')
 The parsing code follows...

Here's the kicker.The rotate.ipipgo.com used here is their dynamic proxy portal, which automatically switches IPs every minute, much more stable than a single IP. Especially when doing long-term crawler projects, this feature can save a lot of heartache.

Common pitfalls QA

Q: What should I do if I get an SSL certificate error while loading the library?
A: Ninety percent of the proxy settings are not correct. Check whether the username and password in the proxy address are copied wrongly, especially pay attention to the special symbols to be escaped.

Q: What should I do if the download speed slows down after using a proxy?
A: It is recommended to change ipipgo's domestic high-speed node. They have BGP lines optimized for Python ecosystems, which are more than 3 times faster than ordinary proxies.

Q: What should I do if I have to use a proxy for my company's intranet?
A: Create a new pip.ini file in the pip folder under the user directory and write the proxy configuration into it, so that you don't have to enter commands every time. The configuration template looks like this:

[global]
proxy = http://user:pass@corporate.ipipgo.com:8080

The doorway to choosing a proxy service

The market is a mixed bag of agency services, and it is recommended to recognize three hard indicators:

1. IP pool should be big enough (ipipgo home standing 5 million + inventory)
2. Connection protocol should support socks5 and http dual mode

<li) Have a dedicated Python technical support team

One last word of caution, in the business of data collection.Don't save the agent's money.The first thing you need to do is to use a professional service such as ipipgo. With professional services like ipipgo, it seems to spend a small amount of money, but it saves the bad thing of having your IP blocked and reinstalling the environment. Especially their new users free 5G traffic, completely enough to install dozens of libraries.