Python crawler template: fast crawl dynamic web pages

Hands-on teaching you to use Python to catch dynamic web pages! Proxy IP anti-blocking trick

What is the biggest headache of the old iron engaged in crawlers? Dynamic web page loading slow as a snail, the data is not yet finished IP was blocked! Today we will nag how to use Python with the configuration of the proxy IP, specializing in a variety of dynamic web crawling does not serve.

Dynamic web crawling three big pitfalls

1. JavaScript plays tricks on you.: a lot of data will not pop up until the page is loaded, and normal requests won't catch it.
2. Website Anti-Crawl Play Heartbeat: Frequent visits immediately triggered by the verification code, serious points directly blocked IP!
3. Thresholds set by geographic location: Some content is displayed in different regions, and local IPs can't get the data at all

How do proxy IPs break the mold?

Here's where we come in.Dual Insurance Program::
- Using Selenium to simulate a real person to handle dynamic loading.
- Rotate IP addresses with ipipgo's premium proxy IP pools

Python Crawler Templates in Four Steps

Step 1: Load the Essential Toolkit
pip install selenium webdriver_manager requests

Step 2: Assign ip ipgo proxies
Go to the official website and sign up to get the API, we recommend using theirIntelligent Package SwitchingIt is a very easy to use, and it automatically assigns IPs to different regions:
proxies = {"http": "http://用户名:密码@gateway.ipipgo.com:端口"}

Step 3: Dynamic page loading
Get a headless browser with Selenium and remember to add random wait times:
options.add_argument("--headless")
driver.implicitly_wait(random.randint(3,8))

Step 4: Exception handling mechanism
Here's the kicker! Automatically change ipipgo's proxy IP when a 403 error occurs:
if response.status_code == 403:: If response.status_code == 403.
get_new_ip() Calls ipipgo's API to change the IP

Practical QA Giveaway

Q: What should I do if I use a proxy IP and get stuck?
A: It is recommended to switch in the ipipgo backendhigh speed channelTheir enterprise node latency can be squeezed down to less than 50ms.

Q: How do I mess up if I need to run multiple crawlers at the same time?
A: Use ipipgo'sconcurrent authorizationFunction, one account can open 50 threads, each thread independent IP not fight.

Q: It's so troublesome to change IP all the time, isn't it?
A: Try theirLong-lasting static IP, whitelisting bound server IPs, one can be used for 7 days without interruption.

Anti-Blocking Tip Triple

1. Randomly sleep for 0.5-3 seconds before each request, don't let the website think you are a robot
2. Randomly select the User-Agent in the list to disguise different browsers.
3. Say what is important three times:Always use a quality proxy! Use ipipgo! Use ipipgo!

Finally, dynamic web crawling is a cat and mouse game. Use the right method + reliable proxy IP, in order to long-term stable data grip. ipipgo recently in the activities, new users to send 10G flow, enough to catch tens of thousands of requests, go to whoring it!