Auto Price Dataset: Historical Quotes CSV Download

How do you get car price data? Older drivers take you on a shortcut

Recently, a lot of friends asked me to ask for the historical price data of the car, saying that they want to analyze the market of the used car or buy a car to cut the price with. It's not hard to say, but if you go directly to the website to get the data, you'll be blocked in a minute, so I'm going to teach you how to use the proxy IP as a magic tool to get the data safely and efficiently, and by the way, I'm going to give you some tips on how to get the data from your home.ipipgoThe service.

Why do I need a proxy IP to crawl data?

To cite a chestnut, you go to the market every day to ask ten times the price of pork, the third day the stall owner must take the broom to drive you. Web site to prevent crawlers is also the same reason, the average user who will refresh 50 times a minute? Using a proxy IP is likeEvery day a different person asks for a price., the site can't be found at all.

import requests
proxies = {
    "http": "http://username:password@gateway.ipipgo.com:9020",
    "https": "http://username:password@gateway.ipipgo.com:9020"
}
response = requests.get('target site', proxies=proxies)

Hands On Data Collection

1. First come first servedipipgo official websiteGet a Dynamic Residential Agent Package, recommended for newbies!pay per volumeto avoid waste
2. Prepare a Python script (if you don't know how to program, you can use an off-the-shelf collection tool)
3. Focused configurationAutomatic IP switchingFunctionality, it is recommended to change the IP once for every 20 pieces of data collected
4. Set reasonable intervals between requests, don't rush like a hungry wolf!

First Aid Guidelines for Common Rollover Scenes

Q: What should I do if I am always prompted for a verification code?
A:It means that the IP switching frequency is not enough, try putting ipipgo'sautomatic rotation intervalFrom 5 minutes to 2 minutes

Q: What can I do if I can't catch all the data?
A:Eighty percent of the IP pool is too small, replace it with ipipgo'sCity-level dynamic IPThe whole country, 300+ cities, just cut!

Private Tips from Data Veterans

1. Disguise User-Agent do not be lazy, at least 20 different browsers to prepare the logo
2. encounter AJAX loaded data, with Selenium + proxy IP combination punch
3. Higher success rate of collection at 2-5 a.m. (site protection may doze off)
4. Remember to use ipipgo for important data.exclusive IPService, stability comparable to old-fashioned sauerkraut

QA time: a must for white people

Q: Is proxy IP expensive?
A:The ipipgo newcomers have5G free trafficTrial, enough to grab 100,000 pieces of basic data

Q: Is it okay to collect data from foreign websites?
A:Our service focuses on the domestic market, and we recommend consulting our customer service for customized solutions for overseas business.

Q: Will I be held accountable by the site?
A:Reasonable control of the collection frequency, only use the public data without commercial dumping, basically as stable as an old dog

As a final rant, choosing a proxy IP service depends on the(med.) recovery raterespond in singingresponsiveness. I've used other IP's before and 3 out of 10 didn't work, pissed me off so much I almost dropped my keyboard. Then I switched to ipipgo.Dynamic Residential Agents, the success rate shoots right up to 95% or more, it really smells good!